Master Takeyasu was the mentor of both Zoom and Zen and a member of the Order of the Flying Fist. He also had some contact with Rawkus, as he mentioned that he met him and he was very wise.
He is seen in The Chosen One, Mouth of the Dragon and Full Revolution.
Master Takeyasu is a old man who is quite versatile for his age. He has shown proficience in combat, as he was able ot hold his own against both Krytus and Kyburi. He is also very agile and accurate.