Let's start with all of the partner and background commanders from the Legends sets and see what archetypes emerge! (Maybe throw in the stranger things reskins for fun)

Perhaps this was doomed from the start.
Emergent themes are +1/+1 counters in Abzan
Tokens in all colors
Artifacts in all colors
Golgari elves, Azorius fliers, and Izzet pirates.

Other themes to build on: Big Butts, Keyword Salad, Auras/Equip, Dungeons, Sacrifice, etc.

Not really inspired at this point (2/20/23), maybe I'll try a different tack for commander cube.