Appendages (multi-tool) – The appendage, almost always an arm, can turn into various tools. Appendages (multi-tool) is also known as Swiss Army Appendage.
Literary Critique of Appendages (multi-tool)
Cyborg (DC) has arms that can turn into a sound cannon, has a finger mounted laser, a grappling hook, a computer interface and other tools (Cyborg #1, 2015).
Inspector Gadget has a confusing variety of tools that sprout out of his head when needed or even when not needed.