Ideas I've had in a while and actually tried to work into trials (only to find out trial design is something you shouldn't leave to me... Yet.)
The "If this happens, I'll die happy" variety: A spoof of the Axem Rangers fight from Super Mario RPG with the Season 1 Veritas.
the "Nostalgia" variety: An FFBE take on the weapon's archives from Megaman 10 or one of Lavos's fights in CT where the mimic the pattern of old bosses with a new twist.
The "GODAMMIT WHY" Variety: a SSB for Ninja, featuring us killing Chizuru's family. Chiz is invincible unless you kill Miyuki and Jiraya first. Hayate can be cheesed by killing a Lady Kaede in your team. They ca