Reality Warping

Scarlet Witch — Rewrote the history and population of the entire world in House of M, then removed the powers of most of mutantkind

Franklin Richards — Created and sustained an entire pocket universe

Mister Mxyzptlk — Can only be removed by tricking him into a self-imposed rule, never by force

Haruhi Suzumiya — Alters reality unconsciously and does not know she has any ability at all

Molecule Man — Exercises absolute control over matter at the molecular level

The Spectre — Reshapes reality as an expression of divine judgement, bounded by a mandate rather than by power

Scarlet Witch — Rewrites the world so that mutants are the dominant population

Scarlet Witch — Three words remove the mutant gene from most of the population

Scarlet Witch — Alters probability directly, the original framing of the power

Thanos — With the Gauntlet, erases half of all life with a gesture

Thanos — Rewrites the rules of the universe while holding all six stones

The Spectre — Alters matter and physical law directly to deliver a judgement

The Spectre — Operates at a scale the Justice League treats as beyond their intervention

The Spectre — His power is stated to require a human host to restrain it

Franklin Richards — Creates and sustains entire pocket universes

Franklin Richards — Stated to be capable of rewriting reality at a level beyond any adult mutant

Franklin Richards — Recreates a destroyed universe and hides it inside a toy ball

Molecule Man — Controls matter at the molecular level, which is functionally reality control

Molecule Man — His stated limitation is psychological rather than a cap on the power

Molecule Man — Originally could not affect organic matter, a limit later removed

Mister Mxyzptlk — Alters reality on Earth at whim, limited by nothing physical

Mister Mxyzptlk — Banished only by being tricked into saying his own name backwards — the rule is a game, not a weakness

Mister Mxyzptlk — He is written as bored rather than malicious, which is why the stories are puzzles

Haruhi Suzumiya — Alters reality to match her wishes without knowing she is doing it

Haruhi Suzumiya — The entire premise depends on her never being told, which is why nobody corrects her

Haruhi Suzumiya — Boredom rather than intent is what triggers the changes

Haruhi Suzumiya — Creates closed space when frustrated, a separate pocket reality

Haruhi Suzumiya — Rewrites the world outright in Disappearance, then restores it

Makima — Kills at a distance through a contract, without touching the target

Makima — As the Control Devil her power is contractual rather than physical

Makima — Uses controlled humans as remote instruments across a city

Galactus — Reshapes matter and energy at a scale the Fantastic Four cannot oppose directly

Galactus — Grants a fraction of his power to heralds, which is how the Silver Surfer exists

Galactus — Is defeated by negotiation rather than force in his first appearance

Zatanna — Casts by speaking words backwards, which is the discipline and the limit

Zatanna — Gagging her removes her power entirely, the standing counter

Zatanna — Her stage-magician career is genuine, not a cover story