Mahito has 1000 hit points, deals 4 damage per hit, and has a large number of moves.
Black Flash
An attack where Mahito runs towards you to attack with his Black Flash, a very powerful attack that can be blocked with a shield.
Black Flash TP
Exactly the same as the previous one, but Mahito teleports to a random area around you.
Transfigured Humans
Mahito creates two transfigured humans; they are quite powerful.
Homunculus
A transfigured human, but this one explodes upon contact with the player (the explosion can damage Mahito).
push
Mahito brings you closer and throws you into the air, worry about having Ender Pearls or a bucket of water
bang bang bang
3 arrow shots
You might think it's all Mahito, but there's still his true form, and that one has no weaknesses... unless you have a Toudou item.