Team Servants: Gremio (S1), Brey/Borya (DQ4), Jakob (FE Fates) vs Team Isekai: Aurora (Child of Light), Frederick (Eternal Sonata), Rabbid Peach (Mario+Rabbids)
Gremio's damage is weak even if he's seen as faster than Aurora's slow wind-up times. Brey will finish off the wounded Aurora, although her free heal means it probably takes two turns so Aurora gets a turn of damage in, but then Brey gets a heal. I don't really know Frederick but I think Brey needs doubles to break through his healing setup, but... that might actually happen? Brey is fast and the stat topic lists Fred as slow-ish and slightly below average HP. Would be curious to hear Pyro's opinion. Proooobably Isekai though because Peach's healing game is definitely hard to break through for Team Servants, maybe if Jakob had Inevitable End to stack debuffs more.