Oh, "app" just means like... writing and submitting an application for a character so you can play them.

Yeah. I mean, I totally can see Yumichika as either asexual because no one is pretty enough, or with Ikkaku. They are, even if they are just friend, platonically in-love. If... that makes any kind of sense.
(I totally just started shipping Rangiku/Nanao, and it completely blindsided me)