Boss stats, shortened from the VP enemy notes, which I will probably not copy over due to them being a FAQ on GameFAQs. Includes DL bosses as well as a few NR/fan favourites.
Basic mechanics:
Physical attacks = (AttackerSTR - TargetRDM) * Multiplier
Magical attacks = (AttackerINT - TargetRST) * Multiplier
As such, all attacks listed under an enemy's STR stat are physical, all attacks listed under their INT stat are magical. All attacks in VP are defence-subject.
With the above info, if you want to take different defences, you can. HP figures are estimates based on one Bracelet of Zoe per level per PC, and no Material Gems or Earrings, and based on an assumption that roughly 4 levels (one HP spike) is gained per chapter. Hard Mode taken as canon (unusual, yes, but VP is a bit exceptional).
Chapter 4
(PC averages: 400 RDM, 200 RST, 10000 HP)
BOSS: Lezard Valeth - 10000 HP
Went second. 0 RDM, 200 RST.
1000 INT:
Fire Lance (1600), Frigid Damsel (2400), Prismatic Missile (3000)
Dragon Bolt (4800), Celestial Star (8400), Meteor Swarm (8400) [These can only be used on turns divisble by 3]
Reflect Sorcery (3-turn magic reflect, all allies) [OPB, used on turn 5]
Note: Lezard is accompanied by two Lezard's Dragon-Tooth Warriors (14000 HP), which place him in the back row (vulnerable to archers and mages only) until they are killed. If killed first, they will possess him, doubling his mHP and increasing his damage by 50%. It is, however, really easy to kill him first since Valkyrie is an archer and mages + her deal excellent damage.
Comments: 4HKO damage, though high 2HKO if you let him Soul Crush every turn. HP is... bad, waaay below average PC (other Chapter 4 bosses, who aren't tanks, have at least twice as much). Reflect Sorcery may spoil some people.
Chapter 6
(PC averages: 1000 RDM, 400 RST, 21000 HP)
BOSS: Genevieve - 10000 HP
Went second. Negligible RDM, 5 RST.
STR unknown, but at most 1000:
Attack - 1 hit to one, element unknown (1)
Contaminate Energy - 6 hits to one, element unknown (6)
500 INT - Poison Blow (400)
Comments: Plot form of Genevieve. It is, however, the only form of her you will ever see on Normal Mode, so if you want to be cruel you could argue for voting on it! I don't think anyone seriously does this, though.
BOSS: Brahms - 52000 HP
Went second. Infinite RDM, 25 RST. Has a 100% block rate, and is very hard to Guard Crush. His attacks are very hard to dodge, but can be blocked at an average rate. Dunno.
15000 STR:
Attack - 1 hit of 0.5x, 5 hits of 0.25x to one, sometimes Guard Crushes if blocked (24500)
Bloody Curse - Used immediately after Attack unless Attack is dodged (not blocked). 17 hits of 1.17x to target of Attack (278460) (!!!)
Bloody Curse is used 25% of the time when Brahms is above 50% HP, and 50% of the time when he is below (roughly).
Comments: Immune to physical attacks, OHKOs average, and does gross overkill if given a chance. Magic durability is... generally seen as somewhere around PCish. Brahms is not considered Undead despite what plot might have you believe.
MAJOR BOSS: Barbarossa - 62700 HP
"Bow before me!"
Went first. 200 RDM, 300 RST. Often blocks, sometimes dodges and counters.
7000 STR:
Attack - 1x to one, can inflict Faint (6000)
Charge - 2x to one, can inflict Faint (12000)
Dignity Mayhem - 3 hits of 1x to one, low accuracy, can inflict Faint (18000)
Hellfire - 1x to one, unblockable, Fire (6000)
Malice Grudge - 1x to all, unblockable, inflict Curse at about 2/3 rate (6000)
5000 INT:
Fire Storm (6900), Fire Lance (9200), Lightning Bolt (13800)
Calamity Blast (34500) [Used only on turn 5, and every 6 turns after that]
Guard Reinforce (RDM x1.5 for 10 turns, all allies) [OPB, used on turn 3]
Comments: Dignity Mayhem can own those without any evasion, and besides that, low 2HKO with lightning magic or physicals. Guard Reinforce sucks. Calamity Blast is clear OHKO territory, though he needs to wait a bit if you force Soul Crushes to be charged. If you allow it every turn, Barbarossa rules. Durability is generally seen as PCish to a bit above.
MAJOR BOSS: Wraith - 100000 HP
"Eeheeheeheehee!"
Went first. 10 RDM, 300 RST. Sometimes blocks or dodges.
4884 STR:
Attack - 1 hit of 0.8x to one (3107)
Whisp - 17 hits of 0.2x to one, unblockable (13205)
13000 INT: (WTF?)
Stone Torch (12600), Lightning Bolt (37800), Prismatic Missile (47250)
Gravity Blessing (56700) [Used on turn 2, and if above half HP on every turn divisible by 4]
Comments: 2x overkill lightning magic, the slayer of Gyaradoses everywhere. He's got nice HP and very decent backup damage (2HKO ITE physical and poison magic with reasonably accurate petrify) too. Undead, though, so you know the weaknesses.
Chapter 7
(PC averages: 1200 RDM, 600 RST, 28000 HP)
BOSS: Lyseria - 12000 HP
Went second. 0 RDM, 2000 RST.
3000 INT:
Mystic Cross (7200), Sacred Javelin (7200)
Carnage Anthem (10800), Seraphic Law (10800), Celestial Star (25200) [Used only on turns divisible by 3]
Dampen Magic (Silence, ~50%, all enemies) [OPB, used on turn 1]
Heal (heals 80% mHP, all allies)
Comments: MDef is awesome, she might actually take some hits from that. Maybe Physical durability is a thing of epic failure. Damage is pretty much the same as Lezard's minus some element coverage. She also has a PC form which is probably more voted on.
Chapter 8
(PC averages: 1800 RDM, 600 RST, 36000 HP)
BOSS: Gandar - 35000 HP
Went first. 50 RDM, 600 RST. Sometimes blocks.
5000 INT:
Fire Storm (6600), Fire Lance (8800), Dark Savior (13200), Shadow Servant (13200)
Gravity Blessing (19800), Petro Disruption (19800), Celestial Star (46200) [Used only on turns divisible by 3]
Comments: Lezard scaled up, without Reflect Sorcery. Still has no durability. Damage is a bit better, though - he actually OHKOs with Celestial Star, and 3HKOs besides that. Plus a crappy block rate! Like Lyseria, has a PC form that is probably more voted on.
MAJOR BOSS: Genevieve - 188800 HP
"Such ugly creatures..."
Went first. 200 RDM, 2000 RST. Often blocks, sometimes dodges.
(1/3 total evade rate according to tests by Monkeyfinger)
7300 STR:
Attack - 1x to one, Holy (5500)
Contaminate Energy - 6 hits of 1x to one, unblockable, Holy (33000)
6500 INT:
Poison Blow (23600)
Cosmic Spear (17700) [Used mainly at low HP]
Indiscriminate - Cast four successive random basic elemental spells (i.e. Fire Storm, Sacred Javelin, etc.) on random targets (0 HP targets ignored). Reflecting a spell interrupts the attack. (65391)
Heal (heals 80% mHP, all allies) [usage unknown]
Sap Power (reduces enemy STR by an unknown amount) [OPB, rarely used on turn 2?]
Sap Guard (reduces enemy RDM by an unknown amount) [OPB, rarely used on turn 1?]
Note: Genevieve is accompanied by two Daemonic Barons (42000 HP) who place her in the back row.
Comments: Getting her to use Heal is a huge pain in the ass, to the point where many voters just ignore its existence, or at best slap a once-per-battle restriction on it. Besides that, Indiscriminate pastes things, and Contaminate Energy is a very powerful physical backup. HP is... solid (well above PC?), MDef and dodge rate are pretty nice, too. Not including Wraith, first obviously Godlike boss. Not the last, though. Vulnerable to undead-slaying.
Endgame
(PC averages: 2000 RDM, 600 RST, 45000 HP)
FINAL BOSS: Freya - 360000 HP
"Can you withstand this?"
5000 RDM, Infinite RST. Has a 100% block rate.
30000 Strength:
Critical Flare - 6 hits at .5x each (84000)
Aerial Burst: 3 hits at .25x each (21000)
Thunder Sword: 5 hits at .25x each (35000)
Ether Strike: 3.9x damage, used 25% of the time from 50 to 100% HP, and 50% of the time anywhere below. Granted, whether she uses that or not doesn't matter, as her attack sequence completely overkills you anyway. (109200)
Comments: Always uses her three normal attacks in succession, with a chance of Ether Strike. Perfect evade, magic immunity, and the one thing that does hurt her (ITE physicals) she is nearly immune to. Damage varies from 3x to 5.5x overkill. Obviously completely and utterly broken. Is a plot fight, not meant to be seriously beaten, and should not be voted on seriously in the opinion of this writer.
FINAL BOSS: Surt - 300000 HP
"It can't be. Evil... you mean to say evil prospers? I do not accept this. I do not accept this!"
Went first. 200 RDM, 1000 RST. Sometimes blocks/dodges/counters.
9000 STR:
Attack - 1x to one (7000)
Flare - 3x to one, unblockable, Fire (21000)
Flare Storm - 2x to all, unblockable, Fire (14000)
Flare Strike - 2x Fire, 1x non-elemental, 2x Fire to one, unblockable (35000)
5000 INT:
Fire Lance (8800), Sacred Javelin (13200)
Ifrit Caress (13200)
Might Reinforce (STR x1.5 for 10 turns, all allies) [OPB, used on turn 5]
Heal [usage unknown]
(Might Reinforced Attack: 11500, Might Reinforced Flare: 34500, Might Reinforced Flare Storm: 23000, Might Reinforced Flare Strike: 57500)
Note: Surt is accompanied by two Vanir (14000 HP); however he starts in the front row.
Comments: Same story as Genevieve for Heal. Otherwise, Good 2HKO physical damage which he can buff to OHKO, and some very solid HP. Block fire and he's not a happy camper... 4HKO Sacred Javelin? Not beating much in any division he's competitive in.
MAJOR BOSS: Bloodbane - 222000 HP
"I'll crush you."
Went second. 1000 RDM, 300 RST. Sometimes blocks/dodges/counters.
10000 STR:
Attack - 1x to one, can inflict Faint (8000)
Feel My Flame - 4 hits of 0.7x to all, unblockable, Fire (22400)
Diseased Tempest - 1 hit of 1x to all, unblockable, adds Poison, Petrify, Paralyse, or Curse (one status type per attack) at about 1/3 rate (8000)
Breath Disruption - Attack, then Feel My Flame if Attack isn't dodged/countered (30400)
Death Sanction - Attack, then if Attack isn't dodged/countered, Feel My Flame, then cast a basic spell (see below) on a random target (69200/88600/88600) [used only below 50% HP]
20000 INT: (!!!)
Fire Lance (38800), Prismatic Missile (58200), Sacred Javelin (58200)
Gravity Blessing (87300) [used only below 30% HP, and only if Death Sanction has already been used]
Heal [turns divisible by 10, and only if HP is above 30%]
Comments: VP Godlike boss. Overkill damage of varying flavours, decent enough HP. Also a godawful status attack if he faces stallers! Defence is above average, Resist is below, neither by a huge amount.
MAJOR BOSS: Fenrir - 250000 HP, Weak: Fire
*howl*
Went first 1/3. 1000 RDM, 500 RST. Has a 100% block rate.
7000 STR:
Icebreath - 1x to one, unblockable, Ice, inflicts Freeze ~25% (5000) (HA!)
Frost Slash - 3 hits of 1x to one, unblockable, Ice, inflicts Freeze ~75% (15000)
Howling Hazard - 2 hits of 1x to all, unblockable, Ice, inflicts Freeze ~75% (10000) [Used below 50% HP]
Frost Bait - 5x to all, unblockable, inflicts Freeze ~75% (25000) [Used below 30% HP]
Comments: Not much at full HP, then freezes you to death, then finally 2HKOs when he's about to die. Anyway, the HP is solid enough that he's near impossible to get past without freeze immunity, and perfect evade's a neat trick.
FINAL BOSS: Loki - 400000 HP
"By the power of the orb, die!"
Went first. 3600 RDM, 500 RST. Sometimes blocks.
8000 STR:
Attack - 1x to one, often inflicts Faint (6000)
Double Attack - 2 hits of 1x to one, often inflicts Faint (12000)
Extension Force - 5x to all, unblockable, Fire (30000)
8000 INT:
Icicle Edge (22200), Shadow Servant (22200)
Carnage Anthem (33300)
Dragon Orb - Great Magic, 3 hits of 1.5x to all, Ice (33300)
Indiscriminate - Cast four successive random basic elemental spells (i.e. Fire Storm, Sacred Javelin, etc.) on random targets (0 HP targets ignored). Reflecting a spell interrupts the attack. (82016)
Comments: More overkill goodness with Indiscriminate, with no shortage of 2HKO backup damage if you don't allow focussing or he faces someone with Reflect, magic immunity, etc. Physical defence is godly, HP varies from decent to good depending on what you hold against him. Good stuff.