Funniest trait about Yosuke's character to me is he'll rightful call out Kanji and Yu for acting sus at any opportunity, but if Teddie acts sus he'll literally make no comment about it.Â
- He never comments at seeing Teddie attempt to kiss both Kanji (King's game) and Yu (potentially in the King's game depending on the choice the player makes/when he wins the midnight trivia quiz).Â
- In P4 dancing at one point in the beginning Teddie steals Yosuke's phone unprompted while he's in the middle of having a conversation with Yu and tells Yu he is coming to marry him tomorrow. No one besides Yu makes a comment about it before everyone moves on like it never happened.Â
- Also in the PQ marriage scene if Yu marries Kanji, Yosuke will be the one to interrupt the wedding at the end, however if Yu and Teddie are the ones getting married Naoto is the one to interrupted it instead of him, which could imply that unlike the Soukan marriage he has no objection to the Narukuma marriage.
And from all this information we can conclude, that Yosuke is okay with Teddie kissing guys and that he may also possibly be a Narukuma/Kanteddie shipper.Â