Power Manipulation – The ability to control, change, decrease and/or enhance the superpowers of others.
Apocalypse (Marvel) explains the enhancement of the superpowers of Caliban in X-Factor V1 #50.
Apocalypse has also enhanced the powers of various incarnations of the Four Horsemen.
Loki enhances the powers of Cobra and Mister Hyde (Journey into Mystery V1 #110).
Galactus also turns in his blue and purple dudes for a snazzy new gold and white outfit as part of the transformation!
Galactus empowered the Silver Surfer but choose to augment Nova’s powers in Fantastic Four V1 #244.
Galactus also augmented the powers of Terrax in Fantastic Four V1 #211.
Marvel comics came up with a superpower plot device labeled a secondary mutation in order to manipulate the powers of many mutants! Mutants the have displayed secondary mutations include Angel (blood has healing properties), Beast (enhanced feline form), Black Tom (turned into half plant being), Emma Frost (gained ability to turn body into diamond), Gambit (ability to convert inert materials into toxic substances), Havok (nexus point between himself and all other dimensional counterparts), Iceman (can turn into pure ice), Phoenix (regained telekinesis), Polaris (increased body mass, strength and invulnerability) and the Toad (prehensile tongue became more powerful).
Angel’s blood burns Nightcrawler instead of healing him probably because he is at least partly Cheyarafim and Nightcrawler has Neyaphem for a father (Uncanny X-Men V1 #431).
The Beast accelerated his mutation long before he took on a feline form in Amazing Adventures V2 #11.
Black Tom first appears with his half plant body in Generation X V1 #25.
Gambit is turned into the Horseman of Death by Apocalypse in X-Men #185.
Emma Frost first assumes her diamond form in New X-Men #116.
Iceman firsts displays his secondary mutation in Uncanny X-Men V1 #415.
Polaris is mutated further in Uncanny X-Men V1 #250.
The Flash Rogues Gallery gain the power of their devices but pay a high price in the Flash Annual 01 V4!
Superman manifests his transformation into an energy being in Superman V2 #123.
Later on Superman Blue splits into two beings in Superman Red/Superman Blue #1.
Synergy (Wildstorm) can activate psionic powers in others (Stormwatch Sourcebook).
Doctor Niles Van Roekel (Marvel) enhances the Thing, Spider-Man, Wolverine and Elektra in Marvel Nemesis – The Imperfects #1.
Next 353) Power Mimicry