Feel like Aya is a weird inclusion with the others in that group. Yukari isn't really around it that often in canon, but she can appear at any time and does so a lot in fanon. Fanon Aya, on the other hand, generally seems to only show up to deliver the paper unless it's a Reimu x Aya work
Maybe Aya can be replaced with Clownpiece, you know, cuz she lives under the shrine
Alright, today we're going to invade Gensoukyou!Wait!Cirno the strongest!We'll start with that eyesore of a Youkai shrine...That shrine has a lot of powerful people and youkai though.Like Tengu and Oni.ProtagonistProtagonistSageTenguOni/Immaterial and Missing Power last bossAntinomy of Common Flowers last bossDouble Dealing Character last bossWe'll be fine!2nd level bossBecause eye'm the strongest!Shrine