Hold on Predict who this could be!

MaxGaming

So this cam be a number of ultrons from the Age of Ultron Comic ultron
The Secret Empires Hank Pym Ultron
The No Strings Attached Ultron
Or even the Infinity Ultron
I dont know but another ultron will be awesome

Doctorwho13

Lots of good ultron variant choices.

But I would go with either:

Alkhema

Or

Jocasta.

SpideyFunko

Jocasta

Magrailothos

My money would be on Jocasta, the 'Bride'of Ultron:

https://en.m.wikipedia.org/wiki/Jocasta_(comics)

MaxGaming

Tbh it probably will be Jocasta but the off chance that it is someone else it will most likely be Hank Pyms Secret Empire Ultron