Body Part Substitution (self) – Ability to replace one’s limbs or other body parts with those of another. Body Part Substitution in general is also known as Anatomical Assimilation, Appendage Assimilation, Frankenstein Power, Limb Replacement, and Organ Replacement.
Etrigan the Demon (DC) demonstrates this power in Blood of the Demon #14.
Terror has this power and assimilates not just body parts but the memories and skills of the person who had the body part (Terror V2 #1).
Skin Devil – Creature Collection I
Cerberus (DC) – Who’s Who in the DC Universe Update 1993 #1
Krillitane – Tenth Doctor – Gamemaster’s Guide
Satanna (DC) – Power Girl V2 #11