How about a Bubble Champion, light as air?
It would be neat with a champion themed around bubbles and lightness.
I imagine a self-cast shield-ability that also makes the champion light as air, causing projectiles to knock the hero away from harms way when engaged. Self-cast bubbles that pop could be used for self-propelled movement with the ability.
He or she could fill the battlefield with bubbles that pop on impact, obstructing easy movement for the enemy team.
He or she could knock enemies back with torrents of bubbles. Bring chaos by trapping enemies in bubbles that bounce left and right!
What do ya thing?

because she has a bubble ability.