Obsidian

You are a ninja for a yakuza clan in the US and has been sent to the forest ninja camp in Japan run by the famed Iga Clan to refine your techniques. There you meet a mysterious participant from Mexico with the code name Obsidian. From what you can tell, he is as skilled as you in the ninja arts. Obsidian is also your bunk mate at the camp. He stands 6’2 and weighs 145 pounds.