Energy Absorption

Bishop — Absorbs an energy attack and redirects it, with a stated capacity beyond which he is the one damaged

Sebastian Shaw — Converts absorbed kinetic energy into strength, so striking him harder makes him stronger

Cell — Absorbs opponents whole to reach successive forms, rather than merely draining energy

Rogue — Absorbs power and memory on contact, which is absorption rather than mimicry — she takes it away from the source

Parasite — Drains energy and ability by touch, with the stolen power decaying rather than persisting

Majin Buu — Absorbs opponents bodily and gains their abilities and intelligence

Majin Buu — Absorbing a fighter grants their abilities and their intelligence

Cell — Absorbs humans whole through his tail to increase his own power

Cell — Inherits techniques from the fighters whose cells compose him

Cell — Drains a human completely in seconds through the tail

Parasite — Drains life energy by touch, weakening the victim as he strengthens

Parasite — Also absorbs memory and knowledge alongside power

Sebastian Shaw — Absorbs kinetic energy directed at him and stores it

Sebastian Shaw — Absorbs energy attacks as readily as physical ones

Killer Frost — Absorbs heat from her surroundings — the cold is a by-product of taking energy, not of making it

Killer Frost — Drains body heat from a person, which is how she kills

Natsu Dragneel — Eats fire to restore his own strength — consuming the element is how he refuels

Natsu Dragneel — Consumes another type of flame and gains its properties

Kisame Hoshigaki — Samehada absorbs chakra from opponents and transfers it to him

Kisame Hoshigaki — His reserves are stated to be beast-like in scale, which is why the absorption matters

Laxus Dreyar — Eats lightning to restore his own reserves

Laxus Dreyar — Consuming a different element damages him, the stated cost

Gray Fullbuster — Devil Slayer magic lets him consume ice to restore himself

Gray Fullbuster — Consumes an opposing ice attack to restore his own reserves

Galactus — Consumes a planet's entire life energy to sustain himself

Galactus — He starves without feeding, which is why he is written as necessity rather than malice

Galactus — The Ultimate Nullifier is the only stated weapon he fears

All For One — Stockpiles dozens of quirks and uses them in combination

All For One — Grants quirks to followers, which is how the League exists at all

All For One — Directs the war from imprisonment through a successor