The heartless who loathes the wielders
Miro is usually calm and manipulative with his opponents, taunting them from the shadows while he strikes out with his sword waiting for the perfect oppertunity to land the finishing blow. He has no sympathy for weaklings and only recognises the strong as fellow heartless. Does not like other people but will put up with anyone he conciders an equal as long as they don't bother him. He harbours a deep loathing of the keybladers, even more so than a normal heartless. Unlike when fighting other opponents when he is around a keywielder he becomes far more psychotic and aggressive than usual with relentless attacks. His attacks might seem to be more powerful and quicker like this but he is far easier to take down concidering he will not fall back when he has sustained massive amounts of damage and has no defencive strategy.
He carries around a long sword with jagged edges on both sides though one side has a part of it that is just like a normal sword's blade that comes to a sharp point at the top.
Miro never speaks about his past and if asked just says that one day he will erase all traces of the light that has wronged him. If anyone persists on the matter he will get all defencive and aggressive about it.