When I make stories with my characters, I like to know how they fight. Otherwise, it's just characters throwing powers and weapons at each other.
So far, TTV haven't even touched upon this aside from brief mentions of how Kopaka fights, him being very elegant, but what does that mean, and what about the others?
Tahu: Tahu doesn't fight; he spars. Every fight with him is a big ordeal, With Tahu doing his best to show off all of his best moves, and also let his opponent show off theirs -- the more flashy an enemy, the more amazing it is when he wins, right? He even likes to let his opponent deal a blow on him sometimes, just to add "suspense"
Iceguy: The Ice Toa is very analytical, and spends the first half of a fight watching his opponent, figuring them out. Then he changes it up, and strikes where you can't block, blocks before you can strike. Occasionally, he will watch an opponent fight someone else (or watch them try to hit Gali) to get an idea of how they attack, then the Ice Toa will take over and finish the fight.
Gali: Hitting Gali is like trying to strike a fly in mid-air. Gali doesn't fight back against an opponent, instead letting them tire themselves out trying to hit her. Then, when they are out of energy, she deals the final blow. (Or she lets Pohatu do it; Pohatu really likes dealing a final blow)
Pohatu: Pohatu only knows one attack: the final one. He relies upon speed and often times ambush or surprise, making the first strike, and always the most powerful, and ending it right then and there. Whenever an opponent is able to resist that strike, and the fight goes beyond the first strike, Pohatu's in trouble. Usually, he will try to pull back, then come in again and make another attempt at a finishing blow.
Onua: Onua is the strongest, and he uses it to his advantage. He doesn't even bother with blocking, just charges in and beats the living cows out of the enemy, swinging like a maniac. At least, that's what he wants you to think. His blows are all carefully selected to first hinder their ability to attack, then strike at their weakest points. And he's smart enough to pull back if an enemy is stronger than he is.
Lewa: Lewa is not a frontal fighter. Instead, she tries to get behind you, strike at an opponent's back. She will slip under your attack and get behind you, and then by the time you turn around, she's already on the other side, striking again. She doesn't do so well against Rahi that have no real front or back, though!