Appendages (antennae) – The character has antennae that can be used for various effects.
Hank Pym (Marvel) has antennae both as Ant Man and Giant Man. As Ant Man the antennae allow him to control ants which makes no sense since ants communicate via pheromones and not electronic signals received by their antennae.
As Giant Man, Hank Pym’s (Marvel) antennae also allow him to control his size and sense the presence of Captain America (Tales to Astonish V1 #58-4 but at least Henry Pym can take off his antennae.
Hank Pym decides to implant antennae into his girlfriend and later abused wife Jane Pym. I don’t know a lot of gals that would want creepy insect like antennae inserted into their foreheads and why doesn’t Henry Pym implant antennae into his own forehead?
Chameleon Boy (DC) uses his antennae to scan what he will shape shift into and his antennae bindings mean he can’t use his powers (Legion of Super-Heroes V2 #294).
Superman (DC) deliberately flies through a cloud of red kryptonite to get some antennae in order to communicate with giant alien ants (Action Comics V1 #296).