I like most characters alright. Not a fan of the little girls, though.
Red:
Black Knight
Joshua
Masked Marth
Lyn+ (Atk+)
Ryoma (Atk+)
Eldigan (Atk+, hp-)
Eirika
...I really like having Distant Counter, so BK and Ryoma fit my playstyle nicely. I also like Armor Emblem, so BK is on a lot of my teams. Arden's build looks awesome, but his art is terrifyingly realistic compared to the rest of the characters and I don't want to use him. Joshua and Lyn are my favorite characters of the swordsmen I have, but I like all of the above.
ATiki(4*)
...I just like Dragons and Adult Tiki.
Tharja (Atk-, fully SI'd, sigh) Need a new one, but currently no Atk+ or Spd+ ones.
Celica (hp+,def-)
Arvis(4*)
...Not a huge fan of any of the above, but I like Bladetome mages, so I want one here.
Blue:
Ephraim(Res+,HP-, full SI'd buffer)
Nephenee
Effie (Atk+, Brave+)
Fjorm
Fjorm (res+,spd-)
...Nephenee is probably my favorite character here. But I love Distant Counter, so Fjorm is a good candidate. I spent a lot of feathers on getting that Brave+ Effie, so I'd like to get some use out of her. Ephraim was my first lance-user I ever pulled.
Ninian
Shigure (hp+,def-)
...I like Dragons AND Dancers! So I'd happy using either of these. It's worth noting that I don't have any 5* red Dragons to inherit Lightning Breath+ from, though. So I need a lot of feathers to make Ninian combat-ready.
Lute (spd+,res-)
Reinhardt
BrideCaeda (spd+,res-)
...I like Caeda as a character, and her bride animations amuse me. Lute is fine though. I'm pretty much stuck raising a Reinhardt no matter what.
Green:
Brave Ike(fully SI'd)
SummerXander
Amelia (Atk+, spd-,new)
Hector (res+,spd-)
Cherche (Atk+, Brave+)
Michalis (4*)
...Ike is my favorite character and his Brave form with Urvan is literally the reason I started playing FEH again. Summer Xander was my first 5* I pulled when I returned to the game since launch. I've put a lot of feathers into BraveAxe+ Cherche, so I'd like her to see some kinda use. I just plain like Hector. Not a big fan of Amelia, but she looks useful.
Fae (4*)
...I like Dragons, okay?
H!Henry (Atk-,Res+)
Deirdre (Atk+,def-)
...I love Armor Emblem, and Henry amuses me. I like Deirdre's design and the only reason I'm not settled on her as my Green Mage is because I'm not sure if it's a waste to give her a Bladetome+ when she has a prf weapon. (Julia is also an option, but I'm less fond of her design.)
Colorless:
Takumi (spd+,hp-, new)
Brave Lyn (Atk+,hp-!!!)
H!Jakob (Atk-, sigh)
...If at all possible, I'm using BraveLyn. Not even because she's top tier, I just really like Lyn and this version of her is super-cool. Jakob is nice because I love Armor Emblem. Takumi is... fine.
Clarine (4*, with lots of SI)
...I don't like most of the Cleric options for one reason or another. And I'm pretty sure only the HorseClerics are considered 'good'. No special attachment to Clarine, but she's what I had when I thought 'I have all these clerics clogging up my inventory, can I feed them to someone to make a super cleric?' I do like Serra as a character though, if that's viable.
I also like any character from FE9, but I think that's 5*-only and like... Soren and Titania, who I don't think are considered that usable?
I like any of the PCs from Smash Bros, too, but... I think outside of Lucina, Ike, and SummerCorrin/Robin (none of which I have), they kinda suck?
Just based on your advice, I'd like to do a Horse Emblem team with a Bladetome.
I'm guessing I could do a BladetomeHenry Armor Emblem team too, but my H!Henry is Atk-, so I dunno how good that is. (probably better than keeping him with his current tome, or going Henry-less Armor Emblem?)
Would BraveLyn be a good candidate for Close Counter?
And perhaps my highly-invested-in Brave+Cherche for Distant Counter? (Not sure why Camilla was the suggestion there? Does she exist ONLY to counter Rein? I'd like to use DC and my Green Flier slot to cover more than one threat, even if it is a major common threat.)