Stuff like matsuri and luna, or matsuri and roboco, or matsuri and haachama or matsuri and...
you get the gist of it, are there any pairings that you miss and wonder why did they stopped or swapped partners? One reason is because of new gens certanly, since senpais will take care of their kohais and collab with them, but I still miss them interacting from time to time... hardmode don't mention pekomiko