Many of the in-depth details used are from Undertale Wiki and the Deltarune Wiki.
Background
Undertale is a RPG and a Bullet Hell game developed and published by indie developer Toby Fox with the help of Temmie Chang.
In Undertale, The Player controls a human child who has climbed Mt. Ebott and fallen into the Underground: A large, place where monsters reside underneath the surface of the Earth separated by a magic barrier created by the humans. The Monsters living in the Underground were trapped there after a war against the humans. The game has 3 pathways Neutral(which contains multiple endings depending on who you spare/kill), True Pacifist, and Genocide, each depending on your actions throughout the game.
Explanations
Power of this Verse
Undertale's power level ranges a lot. The highest beings are Hyper Multiverse level. Where it strives in are the hax like Determination (Which allows the wielder to Time Travel upon death, power null lesser DT users, and a lot more), Time manipulation, Soul Manipulation, Essence Manipulation, Concept Manipulation, Psychokinesis, Bone Manipulation, Magic, and more.
Verse Scaling
Almost everyone prior to god tiers should scale to Mettaton, who destroyed a wall upon his first appearance. Anyone noticeably lower is likely due to them not showing any proof to them being able to scale to Mettaton. God tiers should scale to Chara, who destroyed the world of Undertale. Characters in Deltarune scale to Jevil exploding his scythes as shown here.
Calculations
Knowledgeable Members
Characters
Undertale
Others
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The Annoying Dog
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The Anomaly
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Asriel Dreemurr
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W. D. Gaster
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Flowey
Humans
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Frisk
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Chara
Monsters
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Asgore Dreemurr
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Sans
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Mettaton
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Muffet
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Undyne
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Papyrus
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Toriel
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Napstablook
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Snowdrake
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Loox
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Froggit
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Moldsmal
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Vegetoid
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Whimsun
Civilization
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Underground
