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Basically Confirmed Tier

Likely Tier

No Opinion Tier

Unlikely Tier

How did you even come up with this? Tier

Meme Tier

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Undertale/Deltarune Theories Tier List

Basically Confirmed
Chapter 5 Flower King Dark World
Asgore Chapter 5 Boss
Dess Knight
Gaster Voice
Sans From Deltarune
Gaster Skeledad
Vessel Return
Susie Has Abusive Parent(s)
Susie Half Human
Acid Washed Spamton
Likely
Gaster Hired Muffet
Demons Of The Dark
Ralsei Headband
Kris Slash
FRIEND Mike
Ice-Eram
Seam Crystal Purifier
FRIEND Secret Boss
FRIEND Strange Someone
Mike Strange Someone
Canon Player
Time Loop
The Grand Fountain Must Be Sealed
Gonermaker Interrupted
Everyman Connected to Gaster
No Opinion
Susie Foster Child
Nightmare Knight Theory
Gaster Egg Man
Kris Loses Hand
Papyrus Egg Man
More Than One Ending
Piles of Asriel's Dust
Third Entity Theory
Kris Hand FRIEND
Gaster FRIEND
Gaster Strange Someone
Unlikely
Susie Homeless Orphan
Carol Knight
Eram Headband
FRIEND Crystal Purifier
Main Character Dies
Knight Can Open Fountains Remotely
Noelle Knight
Alvin Knight
How did you even come up with this?
Woody Theory
Rudy Knight
Meme
Ralsestrogen
Papyrus Knight
Created Jul 20, 2026
How likely I think different Deltarune theories are. Comment if I missed one and I'll add it in as long as it's one that people actually believe. This is just my opinion so please don't come to my house and stab me in my sleep for not liking your favorite or something.
Remixed fromUndertale/Deltarune Theories Tier Listby Leo Spruance-kryselmire