It's random but I have funny little headcanons

Todomomo

She speaks English and French fluently.
Todo speaks English as well, and he knows a bit of Spanish.

Kirimina

Kiri knows a lot of English.
Mina only knows Japanese

Miruhawks

Rumi knows English and that's it. She's not fluent and she kind of stutters when she says it. Like she'll say it slow and drawn out trying to remember words. Then she remembers "oh shit, that's how you say chicken?"

Hawks knows a lot of languages because of the Hero Commission. English, French, German, Latin even tho its kind of a dead language (or did I get the wrong one?), Spanish, and a few others but not to many. He isn't fluent in all Of them but he can hold a conversation for a while before he forgets

Iidamei

Iida knows all the languages.

Mei knows Japanese

Kamijirou

Kaminari's strong point is English. He's not fluent but he's really good at grammar.

Jirou knows English. Remember her singing~

Dabi x Toga

Dabi forgot languages~

Toga never cared to learn them.

Nejitama

Nejire is ok at English. Not good but she can say "wears the nearest food place" without help from translate.

Tamaki doesn't know any good languages.

Mt.Kamui

Yuu grew up kinda wealthy and was forced to learn French but she doesn't mind because it's sexy to say and she's best friends with Aoyama.

Y'all I forgot, I remember looking Aoyama up and realizing it wasn't a joke, he's actually French.

Kamui only knows Japanese.

Ryushot

Headcanon time~

Ryuko is mixed. Chinese/ japanese. She knows Mandarin and Japanese.

Shinya knows Japanese and that's all. He picked up on a bit of Mandarin and realized what she's been saying in Traffic.

HitoRei

Yes, they know demon.

Tetsukendou

Nope

SetSero

Meme

Shintati

Shindou knows Spanish and just says some random shit like "chicken sandwich" and Tati is on the ground because she finds it hot-

Tatami doesn't know anything else.

Fatjoke

Fatgum is part American~

Emi might know a bit of German but probably not.

Midotsu

No lol. Tsu has been on business trips with her mom and dad and learned a bit from those but she gets them mixed up.
She knows sign language tho.

Kacchako

Bakugo knows anger~

No he actually knows Hebrew and Mandarin because he had to be the best and learn one of the hardest languages to learn.

Ochako is a big nope. :).