Also known as the Undefeated of the East, he is Domon Kasshu's teacher in the martial arts. His real name is Shuuji Kurosu (which is not mentioned in-series).
First appeared in Episode 15 of Mobile Fighter G Gundam.
The most manly character in the Gundam multiverse, he pilots the Master Gundam and formerly piloted the Kowloon Gundam and Yamato Gundam. Was the previous holder of the King of Hearts title before passing it onto his (foolish) apprentice, Domon Kasshu.
Note: Images with this tag either depict him or his trademark martial arts pose.