BlackBoltRocks said: Quebbster said: Corvus Glaive and Ebony Maw can both help KO opponents faster and boost one of Thanos strong colors. Cull Obsidian boosts the third, though he is more defensive. Proxima can make strike tiles which also help KO a character faster, though she boosts a color that's useless to Thanos. So there is some synergy there. All supports have some extent of synergy with their applicable characters.Perhaps the OP could be referring to character-specific perks. In that case, yes, it seems strange that none of those four have Thanos-specific perks.
Quebbster said: Corvus Glaive and Ebony Maw can both help KO opponents faster and boost one of Thanos strong colors. Cull Obsidian boosts the third, though he is more defensive. Proxima can make strike tiles which also help KO a character faster, though she boosts a color that's useless to Thanos. So there is some synergy there.
On the other hand, they don't really do anything while Thanos is around that we see. He sends them out on separate missions. So I am not sure he would benefit more than anyone else from their presence.