Trinket Lipslums

Trinket Lipslums was a Fuchsteufelwild (a goblin like creature, based upon the story of Rumplestiltskin) he was an IT guy, who was called by a game manufactures team to fix the computer. Upon doing so, he also fixed there game code, creating a revolutionary new game platform. However the team began to forget about him. So he began to kill them, promising only to stop if they could find his name.

History
At the party to celebrate the release of the game, he hacked the security camera's, broke in and murdered one of the team members, the team leader Jenna's boyfriend. He killed him by slicing him in half, through the torso, with his claws. He then, following his kinds traditions left clues at the murder sight, so that the game could beguine. The police investigated this, and tracking through his clues, managed to figure out that he was also a player on an online game, where he killed his victims avatars before he killed them in real life.

He then attacked another member of the team, once again leaving another clue, this one once solved, gave the date that he met Jenna. Jenna confessed what had happened to Nick and Hank, but couldn't remember his name, so the came wouldn't stop. Figuring they were dealing with a Wesen. Nick and Hank examined the Diaries, and found the Fuchsteufelwild was a sadistic creature, that was obsessed with playing games, as well as possessing claws that secreted acid and incredible agility. Following the list of names that its kind used as anagrams. They managed to discover his real name. Giving it to Jenna, she told it to him next time he called, distracting him long enough for her to kill his online avatar.

Angered he showed his true self, and broke into Jenna's home planning to murder her. However anticipating this the police were waiting, using his enhanced agility, speed and acid claws he managed to evade them and escape to the roof, where he was faced off by Nick and Hank, realising he was facing a Grimm, but unable to except losing in any form, he dived off the building killing himself.

Trivia

 * His name is an anagram of Rumplestiltskin, which his kind is based upon.