毘忌尼

Sister Bikini is the loud, motherly, and quirky head nun of Hazakura Temple who takes care of acolytes undergoing training there. Bikini is part of one of the Fey clan branch families whose duty is to protect the Master of the Kurain Channeling Technique. She was the first witness in the case against Iris. 

Bikini is a hearty woman who acts as a mother figure to Iris. She has a carefree attitude about many things, and is known to be quite flirtatious (especially with Miles Edgeworth, but other men as well). She enjoys making innuendo about her name, hinting at her various states of (un)dress during the spring and summer months. She chose her name especially as it "gives people a good image". She can also complain a lot, as she has a back that acts up "violently".

 her Ace Attorney Wiki page.