Omega Sisters

The Omega Sisters(おめがシスターズ [Ω Sisters]) are a pair of twin female Japanese Virtual YouTubers, Rio (pink hair) and Ray (blue hair).

Introduction Video
The Twins' introduction.

Personality
Rio and Rei are friendly, cheerful and good singers.

Trivia

 * Their catchphrase is "omegatteru" - or roughly "are you omega-ing?"
 * They released the VtuberFighters video game, which features them and a host of other VTubers.