The lights are on
The first thing you should do before fighting Tabbu, is to assign Heavier characters, or characters with good range.
When Tabbu Moves to one side of the stage, move away from him. Time your jumps to dodge his Projectiles. Whenever he Executes a shot range attack, hit him with a projectile of your own while he's vulnerable.
When Tabbu jumps behind you and sprouts his wings, immediately move to the end of the stage. Roll or side-step the Off-Waves when he fires them.