Yusuke must dress as a woman

Yusuke - Gay.

Haru - Axe Murderer.

Futaba - She flanderizes herself.

Remember Ann's sweet tooth that really didn't affect her character a whole lot, and only got mentioned offhandedly outside of the buffet scene?

That's her whole character.

Ryuji: idiot
Morgana: talks shit about Ryuji. That's it
Makoto: multiple personality disorder, flips between 'smart' and 'very angery' in the blink of an eye
MC: snarky asshole
Goro: Like Makoto, but with pancake jokes

Thinking about it, I feel like Yusuke probably wouldn't be all that different from how he is now. Just crank the art talk up a little bit and done.

Ryuji will just be ryuji, he's already flanderized himself.

MC: Snarky asshole who loves coffee/curry
Ryuji: Idiot that constantly shouts that he's a Phantom Thief.
Ann: Air-headed ditz that only cares about sweets.
Morgana: Only manners of speech are shit-talking Ryuji and telling the MC to go to sleep.
Yusuke: All art, all the time.
Makoto: "HEY GUYS I'M THE SMART ONE I'M ALSO SUPER VIOLENT AND I'M LIKE THAT BECUASE MY DAD DIED IN THE LINE OF DUTY HELP ME."
Futaba: 4chan incarnate.
Haru: Looks sweet, but constatnly talks about how she loves making Shadows beg for their lives before cutting them down.
Akechi: Has multiple personality disorder - one personality wants to murder MC, one wants to be in a relationship with MC, and the third wants pancakes 24/7.