The Spider (Marvel Comics), an alternate Peter Parker bound to the Carnage symbiote.
Symbiote Wolverine (Spider-Man: Web of Shadows)
Symbiote Black Cat (Spider-Man: Web of Shadows)
Symbiote Electro (Spider-Man: Web of Shadows)
Mayhem (Marvel Comics)
Scorn's (Marvel Comics) symbiote is techno-organic.
Poison (Marvel Comics) is the result of the permanent bonding of Venom symbiote to Peter Parker after he was in a state of dormancy when he rejected resurrection.
Iron Man's (Marvel Comics) Extremis armor is contained in his bones when inactive.
Spawn (Image Comics), like all Hellspawn, has a suit of living necroplasmic armor bonded to his central nervous system, that protects him even when he's unconscious.
Blue Beetle (DC Comics)
Darth Bane (Star Wars Legends) wears an armor composed of orbalisks.
The Symbiotic Galvanic Mechamorph Upgrade (Ben 10)
The Mechamorph Armor (Ben 10: Destroy All Aliens)
With the power of the Jake Jake no Mi, Kelly Funk (One Piece) can transforms himself into a full-skin jacket that others can wear and control the wearer's body, potentially increasing their strength.
Spiral Zetsu (Naruto) had the ability to open up his top half entirely and use himself as a suit of sorts to encase someone in.
Bizarnage (Amalgam Comics)
X-O Manowar (Valiant Entertainment) is a class of alien bio-technic armor of uncatalogued capacity.
The Nanosuit 2 (Crysis) is made of reverse-engineered alien nanotechnology and is so adaptable and advanced, it behaves more like a symbiotic organism than traditional armor.
Major Alexei Belitrov/SCP-2273 (SCP Foundation) is a Russian soldier from an alternate universe who has formed a symbiotic relationship with a biological exoskeleton created by "The Engineers" (SCP-1000) from the genetic material of houseflies.
The Guyver Units (Guyver)
The Symbiote Soldiers (Marvel vs. Capcom: Infinite) are B.O.W.s augmented by bonding with symbiotes.
Sinister Splotch (The Epic Tales of Captain Underpants)
Ship (Ben 10) morphs into a battle armor for Julie Yamamoto.