Anton Ivanov Best Team Compositions and Character Synergies

Dialyn is one of the best stun agents and will grant Anton a massive DMG Bonus as well as a Stun duration extension that he can take advantage of for his Burst window. The only downside is your third Agent would have to be an Electric or Belobog Heavy Industries agent if you also want to activate Anton's Additional Activity that allows him to deal more Shock DMG.

Anton works best in Shock teams, and Trigger or Qingyi are very good Electric Stun Agents that can contribute to keep enemies shocked as much as possible. They also activate Anton's additional ability, and create a ton of Stun windows for Anton to burst enemies down. Trigger has the advantage to not need as much field time as Qingyi, but Qingyi deals more Daze.

Astra is the best support for attack agents, making her the perfect teammate for Anton. Since Astra is neither Electric or from the same faction as Anton, it is best to pair her with either an Electric or Belobog Heavy Industries faction member if you want to take advantage of Anton's additional ability.

Seed is an amazing option if you want to play Anton without having to play him actively on field. Seed's best teams primarily revolve around having another Attack Agent in the Squad. Anton will play the Vanguard role for Seed: you swap him in regularly to use his EX Special, before switching back to Seed who will gain a massive DMG bonus.

All those are viable for Anton. Grace and Rina being the best choices as they will trigger his additional ability.