The most powerful yuri heroine is obviously Lambdadelta, because she could kiss literally every girl if she wanted but concentrates all of that energy on her beloved Bernkastel instead.

当たり前に最強の百合ヒロインはラムダデルタ、文字通り一々の少女をキスできるでも、それより愛してるベルンカステルに注力したいだから。