Wanna be the Strongest in the World!: Elena Miyazawa

 Elena is the co-singer with Sakura in the idol group 'Sweet Deva'.  She has a long standing rivalry with Sakura stemming from jealousy over being seen as 'Sweet Deva's' second best member.  She also secretly trains as a wrestler and it is hinted she might have more potential than Sakura in that regard.

Phi Brain: Erena Himekawa

Erena (Elena) Himekawa is a puzzle idol who hosts a game show called 'Puzzle Kingdom'.  Given the name ' Antoinette' by the P.O.G. she starts out as arrogant and pompous, but eventually becomes more mature and is often the voice of reason of the group.  She develops a crush on Gammon.