Rengoku - Arson. Something about setting the houses of all who hurt Senjuro on fire really "set's his heart ablaze."

Shinjuro - Being drunk and disorderly. Probably swore at some passing kids and told them they'd never amount to anything.

Sanemi - Assault. For winding ( ͡° ͜ʖ ͡°) a guy he got into a bar fight with.

Shinobu - Attempted murder. Of Douma.

Giyuu - Also, attempted murder. He'd gotten fed up and had quietly tried to drown Shinobu.

Tengen - Public indecency. For trying to show off too much of his "flamboyance."

Obanai - Assasination. Of some poor chap who looked at Mitsuri the wrong way.

Mirsuri - Stalking. (Although I feel this one is more of a misunderstanding...) Since she's too shy to talk to the one's she admires, she ends up just following them.

Gyomei - Manslaughter. (I mean, he'd never hurt anyone on purpose...) For not realising his own strength and accidentally killing a weirdo who had tried to lure some children into his car with sweets.

Inouske - Disturbing the peace. Trying to challenge and pick fights with everyone and their mother.

Zenitsu - Also, for disturbing the peace and yelling "NEEEEEEEZUKO - CHAAAAAAAAAAAAAN!" at ridiculous hours of the evening.

Tanjirou + Nezuko + Senjuro - For being too adorable. It's just not legal.

Muzan - Crimes against humanity. For trying to wipe out a continent or the attempted destruction of the human race.