I mostly only ship w one person (bc i'm too much of a wuss to talk to anyone else abt oc dynamics at all even friendships sfsdgd) but generally if i see a character i like i ask nicely and make my own oc, or he'll do the same, and if we happen to make 2 characters that happen to match up well? cool ship. But for the most part i think its me seeing and going "hey marriage??". I get invested just from talking abt them, bc its hard to make a character who i really dislike, and we just kinda vibe and i get lowkey obsessed for like a week to a month in which the ocs develop rapidly and then i get attatched and u kno,,,