The connecting record
statedThe Immortal Hulk · 2019
The One Below All killed Franklin Richards in The Immortal Hulk.
in a far-future timeline, and recounted rather than depicted
What each of them is ranked on
The killer · The One Below All · off the scale
The thing behind the Green Door — comics
The other end of the same being. It lives at the bottom of the Below-Place, it wants everything that exists to stop, and its route into this universe is the Hulk: every gamma death goes through its door and comes back wrong. It is up here rather than ranked because it almost never acts as itself — it works by possession. In one far-future timeline it wore the Hulk as the Breaker of Worlds and killed Franklin Richards, then Galactus, then everything else, because what it wants is to be alone.
statedThe Immortal Hulk · 2018
Named as the inverse of the One Above All, dwelling at the base of the Below-Place.
shownThe Immortal Hulk · #25
In the far future it kills Franklin Richards, Galactus and Mister Immortal, until nothing else is left alive. — 2019
shownThe Immortal Hulk · 2021
Possesses the Leader, who has stolen Banner's body, and is fought directly when it manifests.
The victim · Franklin Richards · rank 5
The kid — comics
When Onslaught apparently killed most of Earth's heroes, Franklin had already built them a working universe to be alive in, and it ran for a year of publishing before anyone worked out where they were. He was a child. The books are consistent that this is nowhere near his ceiling.
shownHeroes Reborn: The Return · 1997
The pocket world the apparently dead heroes have been living in is revealed as his creation.
statedFantastic Four · #604–605
The mature Franklin restores and empowers Galactus, who becomes his herald. — 2012
What this does not settle
One death in one work. It is the only place the record puts these two in the same room, and it is evidence about that meeting and nothing wider — not a general matchup, not a rematch, and not a ranking of its own.
The ladder above it is argued from everything either of them has been shown doing; this page is argued from one citation.
Where the two disagree, the disagreement is the point, and it stays visible rather than being resolved by whichever of them happens to be on this page.