Remember those dev diaries from last year. One of the things that I was quite excited about was the Strikers idea; this was presented as a special attack where another champ would briefly join your fight and put in a few hits before disappearing.
I'm not chasing for an update on where this is at as I know there are loads of things people want and the devs have enough to do.
What I was thinking is, what tag teams would you guys like to see / use?
The original posting mentioned synergy connections so perhaps thinking around those might help to think of the possible options.
AA and Psylocke would be a pretty cool sp combination neurotoxins with power drain / steal.
You can read the dev diary here if you want to see what they said -
https://playcontestofchampions.com/dev-diary-a-contest-evolved/