New way I have found to rank via numberical numbers! Yay to use and such! Idea Seta come from to utilize here.
Chie Satonaka - 3.98812 - Fast, damage, Power Charge while spamming Bufula is actually a decent strategy, as it heal-locks. Nulling ice is decent. Overall, good stat set-up, and the equip options are sexilicious.
Kanji Tatsumi - 3.666666666666 - Ok, not sure exactly where to put him. Tank! Damage is decent! Taru and Rakukaja! Equip options are also nice. Still...slow, no evasion fun, and lacks on a lot of the really cool options the rest of the cast gets. He really could go either way... so defaulting to a lower division.
Naoto Shirogane - 3.81335 - Kind of like Chie, except no damage! But loads of evasion, speed, and instant death. Frail, but...eh.
Souji Seta - 4.88301 - Options are fun. Can't touch the super power Godlikes, but is...probably the best PC Godlike ranked. Which is quite a feat.
Teddie - 3.44901134 - WORST IN THE CAST OMG! Wishes he could get the Auto-suku armour, but eh. Hates electric weakness, and his resistances aren't too amazing (but good overall). Frailish, but high enough damage, healing, support skills, works.
Yosuke Hanamura - 4.0091375 - He...just does everything really well. Even his healing has uses. Put him a little above Chie since his magic is better and less resisted.
Yukiko Amagi - 3.59122 - Teddie with better resistances and better durability overall. Granted, also has wallable damage, but...eh. What can you do?
Avril Vent Fleur - 2.45976 - Effectively average damage, but decent enough HP and DEF and RES, although she's a bit slow. Has...a few neat skills to use. Just...can't see her above Light, really.
Carol Anderson - 3.58773 - Drain! Speed! Durability isn't bad since the cast is so damn average. Decent enough.
Chuck Preston - 2.81239 - Well...I can see him in Middle, but...again, when unsure, go for the lower division. His damage boost is great, and he's overall above average in everything. Wishes he had a different Medium, but not bad.
Dean Stark - 1.633119 - To ensure Rebecca is better, I have to take Dean with Black Fenrir. Granted, this makes him infinitely cooler plotwise, and since that's more important, I think this works. Anyway...nothing really outstanding, so this fits here.
Elvis - 4.88888888 - The weaknesses suck, but, like all the Sentinels, I take them at the same level (since...you aren't forced to fight them in any specific order, and I fought Kartikeya first, Persephone last, etc.). He has pretty freakish durability and great damage.
Fereydoon - 4.921178 - Fast, instant death attached to the damage kills lots. Also has Protect for great defense, and his weaknesses are...good and rare.
Greg Russelberg - 3.54778 - Does not like the low MP, but the damage is...decent enough, although he really needs to move to a leypoint first. Speed is eh, but Auto-Guard helps him survive a bit better than normal, and he has decent enough HP. Just...probably wishes he had Hi-Blast instead of Hi-Crush? Also loses a few points for being unattractive.
Ice Queen Avril - DNR - Not comfortable with ranking her separately - after the fight, they merge, and while IQA has some personality come out for AVF, none of the power does. It's in Avril's mind, and...never again. While they were separate in the past, I'm inclined to believe it's battling a memory, and AVF is the frue Avril...just don't feel comfortable ranking them both.
Kartikeya - 4.944112 - Probably the best overall. Like Fereydoon, great weakness set, and he has the best durability of the group, and really strong damage overall. Good speed, and his Duel Form is...potentially useful with the instant death. Probably has the best options overall of the Sentinels.
Nightburn Acklund - 4.33444451 - Fast and durable, although the damage is lacking (even on a leypoint). Really common weakness. Still, boss durability and the like pushes him up.
Persephone - 4.91145 - Loses to bosses generally, and anyone with excellent water damage, but...her overkill is the best of the bunch, though she doesn't have status. Granted, Quicken has uses.
Rebecca Streisand - 2.912223 - Continuous Attack was more akin to 20-25% chance each attack. She also has speed, and while her durability could be better, she has excellent damage vs. Black Fenrir Dean. Still Light, probably, although points for cuteness.