Oh boy.
Skill:
Limb borrowing.
Upon physical contact with a biological subject, the skill owner has the opportunity to steal it. It is possible both to steal it painlessly, creating the appearance that the limb was missing from the person at birth, and to rip it from the body. Doesn't work on non-biological subjects.
The engraftment of limbs.
The owner can attach a limb to themself in order to get the skills of the limb owner. The larger and more significant the limb, the greater the chance to get a skill.
(if there's a character in the glossary, I probably have their limbs. I don't have the limbs of:
Azure, MidnightFox, Enigma, HelloHound, Tony, Hans, Aaqil, Glitched, Tender Human, NAC-JAC, The Monotone Puppet, Tsumi, Iamnotabot, Nahrenne, Chiyuki, Nyxia Lux)
Hammerspace.
A virtually infinite subspace that only the skill owner has access to.
(SRB has the strangest collection of limbs and things in his hammerspace and lots of vodka)