Amusei is an argonian thief and his dream is to make it big in the Thieves Guild. He is not very bright and has a rough journey torwards his goal, often needing to be rescued several times.
Amusei like most argonians was raised near Black Marsh in Leyawiin but left to try his luck in the Imperial City. During the initiation quest into the Thieves Guild Amusei mistakenly ends up in the center of the Talos Plaza District. He never gets a second chance like the other new initiates, being called a 'bungler' by the guild and disappointed returns to Leyawiin to try being a freelance thief.
After being caught and sent to the dungeon you can give him a lock pick and after escapeing he travels to Skingrad. After being caught in Skingrad and spending time in the dungeon he becomes the next potential victim of the Pale Lady. After being saved he will return to the Imperial City and finally get accepted into the Thieves Guild. He will soon be trusted enough to deliver messages from the Gray Fox himself.