The Srange Creature (A Tentacled Romance) is mostly just tentacles.
Abyss the Squid (Archie's Sonic the Hedgehog)
Dark Gaia (Sonic the Hedgehog)
The Centauri (Babylon 5) possess six tentacles on their sides that double as their genitals.
Kevin 11,000 (Ben 10) possesses Null Guardian's tentacles.
Ultimate Kevin (Ben 10: Ultimate Alien) possesses Ghostfreak's tentacles.
Priscilla (Claymore) extending her fingers into tentacles to impale her enemies.
Tyki Mikk (D.Gray-man), in his awakened state, can extend many tentacles.
Maji Kayo (Dragon Ball Super) using tentacles to restrain Goku.
The Shadow Blot (Epic Mickey)
Coldsteel (Gargoyles) uses robotic tentacles in his arms.
Kagura (InuYasha) impaled on Naraku's tentacles.
Sounga/So'unga (InuYasha) sprouts multiple tentacles from itself to anchor Inuyasha's hand to it.
The Thing Monster (John Carpenter's The Thing)
Vampires (JoJo's Bizarre Adventure) drain blood from their victims using retractable tentacles in their fingers.
Dio Brando (JoJo's Bizarre Adventure Part I Phantom Blood) extending tentacles from his severed neck to attack Jonathan Joestar…
…and to reattach his severed arm.
The Elder God (Legacy of Kain) is little more than an amorphous mass of tentacles and eyes, the former of which it uses offensively to great effect.
Thresher, A.K.A. Experiment 544 (Lilo & Stitch)
Fused with the Ghost ÄRM, Hydra, Chimera (Marchen Awakens Romance) can generate sharp tentacles from the demon's body.
...Generates tentacles from his back.
Dr. Octopus (Spider-Man 2)
She-Venom (Marvel Comics)
Gelt (Marvel Comics) is a Deviant with the power to sprout tentacles from where is arms are located.
Omega Red (Marvel Comics) uses his carbonadium tentacles to great effect.
Agent Venom (Marvel Comics)
Anti-Venom (Marvel Comics)
Solidus Snake's (Metal Gear Solid 2: Sons of Liberty) exoskeleton comes equipped with "Snake Arms" that can strangle opponents and fire missiles.
Laughing Octopus (Metal Gear Solid 4: Guns of the Patriots)
Killer Bee/B's (Naruto) Partial Transformation.
The fake Groudon (Pokemon: Jirachi Wish Maker)
The Dahaka (Prince of Persia: Warrior Within)
Dahaka (Prince of Persia: Warrior Within)
James Heller (Prototype 2) using his tendrils.
William Birkin (Resident Evil)
Las Plagas (Resident Evi)
Nemesis's (Resident Evil) tentacles are sharp enough to penetrate human flesh and bone.
The Nemesis T-Type (Resident Evil) attacks Jill with a tentacle.
Alexia Ashford (Resident Evil)
Uroboros injection (Resident Evil)
Alex Mercer (Prototype Series)
James Heller (Prototype 2)
Meat Sweats (Rise of the Teenage Mutant Ninja Turtles) possesses tentacles in place of hands that he can use to drain energy and powers from other mutants.
Jimon's (Samurái Deeper Kyo) Kenyou form.
SCP-058 - Heart of Darkness (SCP Foundation) has several tentacles protruding from the top.
Ultimate Spider-Man (Spider-Man: Shattered Dimensions)
Doctor Octopus 2099 (Spider-Man: Shattered Dimensions)
In their human form, Inkling's (Splatoon) "hair" is six of their tentacles from their squid form.
The Squid Sisters (Splatoon), Callie (left) and Marie (right)
Cap'n Cuttlefish (Splatoon)
DJ Octavio (Splatoon), like all Octarians, possesses tentacles.
Annie (Splatoon), being a sea anemone, has tentacles for hair.
Jelonzo (Splatoon), being a jellyfish, has tentacles.
Eight/Octoblock (Numberblocks) an example of this power.