The 2 graveyard ones are locked behind the puzzle in the manor :)
The final challenge is activating all blooms (like you did) and going for a dungeon. It will put you in a very hard boss gauntlet.
As for the last gallery character, it's from the vampire questline. That questline is started already if you have the one before that. If not, unlock the vampire female and male animations in the gallery, sleep 1 day, and go to the dormitory to start it.
I'll try my best, but I highly recommend the discord (discord.gg/7nsmuvcZEE or the discord icon in the itch page) as ppl are more active there.
So first things first: manor puzzle.
Align each candle with the window. Each window represents a candle. A flame above the window means the corresponding candle's flame has to be lit. No flame means the candle has to be off.
Once that's done, a second puzzle opens on the wall on the right side.
The puzzles are way easier if you upgrade the flame spell (the very first spell) and buy the "shuffle" spell.
