Ships have certain elements that show they're together.

Kamijirou has matching hair marks, Matching costumes, and their quirks fit together. It's obviously canon too so like-

Ochako is a different story. She and Bakugo share a designer just like Kamijirou. But she changed her costume to look more like Deku's.

Kirimina both have masks, I don't know if that's important cuz most heroes have masks, lemme go find some evidence.

Kirimina have weird jackets lmao.

Todomomo. They just have moments. They don't really need any matching elements.

Anyways, I'm bored.