ooh, great question, anon !!

(if we're talking about tensei (probably not), my favourite ship for him is tenkoi, from vigilantes !!)

my favourite iida ship is probably todoiida, though seroiida is a close second. of course, because i love both of them, and i'm also a seroroki shipper, i also love serotodoiida, which is the poly ship between the two of them. the thought of sero with his two autistic bfs brings me joy <3

iidayama is also adorable, and one of my favourite aoyama ships. i saw the licensing exam and never looked back. i feel like their relationship would be very knight in shining armour x damsel in distress /pos

iidabaku is also on my radar, though i don't read many fics of them/consume a lot of content of them. i mostly only ship them because i think their fluff would be good and their smut would be hot (〃ﾉωﾉ)