They could at least have included Shrinking Violet. They had room.

And the Legion of Superheroes is woefully underrepresented as well

So far

X-men vs. the Legion?

Lightning Lad vs Storm
Bouncing Boy vs. Juggernaut
Though Bouncing Boy vs. Wolverine would be hilarious
Ultra Boy vs. Rogue
Matter Eater Lad vs. Gambit
Ferro Lad vs. Magneto feels unfair
But Wildfire vs. Cyclops should even things out since heat beams wouldn’t phase him at all

Same

Do the blues!

Happens to me all the time