My pocket of change
Art
I personally think the art direction is just... Okay. Out of the three Lords we're given Edelgard is the only one I like, as Dimitri is a bit too basic, and Cluad is... eh.
The style itself as many had pointed out is similar to the Persona series, which is fine... But It doesn't look anything like Fire Emblem to me. I'm sure it could be argued that Fire emblem had never had a set and stone art style and that's true but all Fire emblems have had a certain... Feel(?) This doesn't, it looks like a Persona Game.
I don't know, maybe I'm just spoiled by Hidari"s drop dead art. Sadly though that seemed to be a one time gig type of deal, seeing as HIdari is a very busy artist and it took them 3 games to even get him when he wasn't busy, I'm kinda sad that he didn't stick for a game or 2 but it is what it is and possibly that's what holding me back from truly accepting the new artist...
Also, Byleth, put your goddamn coat on you look like a 6 year-old playing pretend superheroes.
Also, also, Dimitri please wash your hair it's so freaking greasy it's disgusting, you look like a wet blanket.
Personality
Literally none of these people have spoken anything other than battle quotes and out-of-context phrases from plot important moments.
But going off hand I'd say
Edelgard, is the astute young lord who is optimistic who is training to be a most proper lord who can protect and probably has a teacher-fetish.
Dimitri, is our Camus with worse hair.
Claude is there.