Suggestions in DONTFORGET

i have some idea for pvp so there is new room for pvp in underfell style it named hard mode pvp it using KR and attack be more dangerous like gaster blaster jumping soul and any attack that make game more hard and fun this and thank for read this
I have an idea to add Story Mode Harlow in DFC.
what about you making your own characters then playing with it i have a character i really want to be in df so it would be nice to see this (thanks for taking your time to read this)
if Online PVP if ur Sans you Have a Gaster Blaster you can put where it will spawn and the bones too and asriel you need to unlock him becuase he have the stars swords fire and the blaster and lightning
Decorate all the map with new year decoration (and put to sans frisk and papyrus and the others new skins for new year like sansa claus ect...)
Maybe a song idea channel, so people can post songs and say where they think that song should belong and like, the administration checks it and decides "yes or no"?
idea for that potato skin:
you have to have 100 of one pog
I think Don't Forget would be TONS better if every character got a second costume (e.g. Undyne's armoured and non-armoured forms)
Custom rooms? I dont know if people would like this but I think it would be cool to be able to create your own small rooms and let others come there. You could also add a rating system where people could enter see your room and rate it.