Image if Izuku kissed the DekuBowl (on the cheek) and their reactions-
Bakugo: Flushed and confused while Izuku apologizes if it was bad saying he didn't know what came over him. But then katsuki (being katsuki) screams "I'LL SHOW YOU THE BEST KISS OF YOUR LIFE!" And fucking pulls the poor boy by the collar forcing him into a kiss.
Todoroki: The sweet child he is and have never experienced love or affection, he blushes slightly and is on cloud-9 all day majorly confused on what happened.
Ochako: Totally flushed and floats into the air covering her red face.
Tsuyu: Grabs Midory's hand gently and says "Kero, I like you too Midorya-Chan." Then pecks him on the cheek smiling while Izuku is totally flushed but still does not remove his hand from hers.
Tokoyami: blushes a bit and says "I don't like bright things, but you are an exception..." While Dark Shadow is cheering his boy on excitedly.
Iida: Mad blush x100 and try saying something but just stumble over his words and stutter like crazy.
Momo: Smiling at the short boy and bends down to pat his head, gently kissing his cheek.
Jirou: Being the awkward queen she is, she would blush fully while they sit their in awkward (but comforting) silence. At the last minute she would pull him into a kiss then sprint away while Izu is confused on what happened.
Mina: Smiles and freaking dips him saying "Might as well do the same." And kisses him back leaving Izuku a blushing mess.
Kirishima: He would be caught off guard and when it sinks in, he smiles at him his cute puppy smile and yells at him "THAT WAS SO MANLY MIDO-BRO, DO IT AGAIN!" So Izuku being the weakling for that smil, he is will but this time Kiri moves his head so he can kiss him back making Izuku as red as his hair.
Kaminari: Be so shocked that he would go into his "dumb" mode a bit and Izuku would panic and try helping him all day (even after he recovered) because he felt so guilty.
Sero: Confused and when it hits him Izuku is running away from him so he uses his tape to slingshot himself to him, sweeping them both off the ground and kissing him.
Ojiro: Blushing crazily while hiding his face in his hands (and tail) while Deku apologizes, he grabs his hands gently confessing he also liked him too.
Shinsou: When Izuku is spliting out his apologie, Shinsou ends up brain washing him and tells him to do it again.
Monoma: Suprised blushes and looks around and sees no one so he pulls him into a kiss tellling him "Tell no one about this. I can't have my reputation ruined because I fell in love with a 1-A dork."
Shigaraki: He would be confused and ask why he would kiss a villain like him. Izu would apologize and try running away but Shiggy just grabs his arm and with him belong starved of affection and love for all these years he would beg him not to leave.
Toga: Smiles and kisses him on the lip, biting them. While Izukus lips are bleeding she (seductively) licks them just to get some of his blood.
Dabi: He smiles and pulls him onto his lap so he can kiss and adore him.
Hawks: Smiles at ruffles his hair kissing him on the forehead.