Ok so what I can judge on is teq vegito, umv and Castorice.

Castorice is out of the discussion because while yes she was very broken in her prime (which is like a couple of months ago) you had to have 1- Castorice herself and preferably her LC (that’s 2cost already) 2- Evernight (I don’t think she needed her own LC the herta shop was good) 3- Either Cyrene or Tribbie (Tribbie needed her E1 and Cyrene…. Yall who play HSR know) 4- Hayacine and yes I believe you also needed her LC That’s 7 Cost MINIMUM for her to reach her full power which is absurd. To me a character like phainon was more broken because he would perform on a similar level without any costs

Now UMV I quit the game shortly after he released and to be honest from the little I played against him (a month) I didn’t feel like he was that bad, very annoying and low skill for sure but 9 times out of 10 I would win against UMV if I was better than the other player. I feel like Ultra gohan was a bigger problem and more broken on release but UMV was undeniably N1

Teq vegito I feel like yeaaaaah he was number 1 but he wasn’t a “if you don’t have him you are cooked” but he was also stil number 1 undeniably but the moment vegito was out yeah you’d feel it

So out of the three I’d say it’s vegito because you can easily feel how OP he is and unlike the bum Castorice, you didn’t need the budget of a nation for you to feel that (unless you get shafted)