Focusing on only "you are a melee character and the enemy can fly, how not be useless":
"See it Coming" -- mostly nullify long range attacks, mixed with "Olympic Leaps" -- jump extra far and "Ride'm Cowboy" -- grab a hostile creature, and if it is larger than you you "ride on it".
The three of them together (a) forces the foe to close, then (b) lets the hero engage if they do come close.
Being vulnerable, or less invulnerable, to close range ranged attacks can help make the defence from being over-strong.
"Bring it Down" would be ability to knock flying foes out of the sky, paired with either "Long Arm" or non-incompetent bow abilities.