CMC + DT and SS :)))
man I have a lot to say about them i love them so bad
while i do love the cmcs matching cutie marks i just,, never thought they were cute but the idea is definitely there. In my AU they still helped ponies get their cutie marks and helped diamond tiara discover her talent, how they got their cutie marks is different, though they got them on the same day. Some ponies still go to them for advice on how to get their cutie mark, but they're too busy to be helping fillies anymore.

(Headcanons for all the characters are at the source)