I'll make a safe world for her... I don't care about anything else.
Grimm was a powerful player of Sword Art Online, and was the last Reaper.
Grimm wears a black hooded cloak with white trim and hem over his entire outfit with a metal guardplate over his left shoulder, although he usually keeps the hood down. Underneath he wears black combat shoes, black pants and a black shirt with white accents.
Mysterious and introverted, Grimm barely makes contact with anyone and is rarely seen anywhere. He is quiet, preferring only to talk when necessary. He believes in his own personal fight for justice, making it a personal vendetta to rid the game of all player killers, essentially making him a Player Killer Killer (PKK).
Towards those he cares about, espeically his younger sister, Emily, he is very kind and compassionate, willing to do anything for their safety, going so far as to kill others to keep them safe.
Grimm is very close to his little sister Emily, much moreso than either Hans or Archer. Emily became attached to Grimm after the death of their parents, when Grimm promised that he'd always protect her no matter what. The two are very close and spend a lot of time together. Grimm makes sure to keep Emily away from the darker side of the world, and also does not tell her about him being a player killer, nor the fact that the Reapers were a PKK guild.
Grimm is renown across Aincrad as an extremely deadly player rivaling even Yamato and Ishi. He is extremely skilled with his personal weapon, Corvus, being able to end most fights in one swift strike from his scythe. His signature skill, Death Scythe, allows him to do this, by killing any player or NPC instantly with one single strike, even if the wound would not be fatal without it, completely ignoring all variables that would protect the player.