Remember, Rokugan has an extremely rigid caste system, and the samurai tend to take a dim view on people that try to become upwardly mobile. The eta could try to pass himself off as a samurai, especially if he was a servant to a samurai - probably a Kitsuki, since they often investigate murders and need someone to move the body around. How he got his master's swords is a question that needs to be answered - most likely, his master's dead, and he's masquerading as a ronin. The problem is if anyone finds out he's not a samurai, he's as good as dead. Most samurai will simply execute him and send his unclean soul to Emma-O for judgment. A Scorpion might not, and use this tasty bit of blackmail to make him dance to whatever tune he chooses - in which case, the eta probably wishes a Lion found out.

Done well, this could be an awesome character.