1 Giygas - Earthbound
I don't doubt that this list was created just for this boss. The atmosphere is surreal and completely contrasts the entire game up to that point, the design is creepy, and the music is perfectly horrifying and strange. NOBODY could have predicted how utterly disturbing this cutesy, colorful game's final boss would be. - Phenenas
Don't do PSI kids. Stay in space!
2 The Masked Man - Mother 3
Picture this; your twin brother tries to avenge your dead mother and presumably died, and halfway in your journey you find a figure who looks similar to your brother working with the antagonists. Later on, you find out that the figure IS your brother, who have been converted into a lifeless cyborg. The final battle is accompanied by a cacophonic mess of sounds. Giygas scares people because of his looks. The Masked Man is scary because of who you're forced to fight against
3 Metroid Prime - Metroid Prime
4 Golden Diva - Wario Land 4
She's not too bad until her final few hit points... that face alone makes me put her at #5.
5 Mother - House Of The Dead: Overkill
6 Pyramid Head - Silent Hill 2
This wasn't a final boss. It was an enemy that couldn't die - Spiral_stairs
7 Osmund Saddler - Resident Evil 4
8 02 - Kirby 64: The Crystal Shards
Blood in a Kirby game. enough said.
9 Lavos - Chrono Trigger
10 Sans - Undertale
Sans or Sans the Skeleton is a character in the 2015 RPG Undertale created by Toby Fox. He is a lazy, pun-loving skeleton who is a supporting protagonist in the "pacifist" and "neutral" routes of Undertale, and a heroic antagonist/final boss of the "genocide" route. He is known for his incredibly difficult ...read more.
Well, this being a final boss is up for debate I suppose, but he's the last enemy for the genocide route, so I'll consider him one of the three. As someone who spent an enormous amount of time fighting this guy, learning his patterns, and eventually slaying the most lovable character in this video game, it almost makes you reconsider your choice to kill every single mob in the game. Almost.
11 Infected Aurora Unit - Metroid Prime 3: Corruption
12 Marx Soul - Kirby Super Star Ultra
13 Ballos - Cave Story
14 Super Dimentio - Super Paper Mario
I'm not gonna write a long winded thing like I did for Star Dream, Dimentio is evil, and has no real reason to be that way, and he took poor Luigi with him :(
15 Omega Flowey - Undertale
A giant photoshop abomination with a very very questionable design.Omega Flowey's laugh on it's own is enough to put it at the top 5.
What a flower looks like when you are on Drugs
16 Queen Pulsating, Bloated, Festering, Sweaty, Pus-Filled, Malformed Slug-for-a-Butt - Earthworm Jim
17 Cackletta's Soul - Mario & Luigi: Superstar Saga
Disturbing, but really more irritating than all else. - Garythesnail
Easiest boss when healing!
18 Bowser? - Luigi's Mansion
Scared the heck out of me as a kid! That actually creeped me out so bad when I was little,I had to stop playing for a few years,because I kept having nightmares every night about that ☹️
19 Nihilanth - Half-Life
20 Mother Brain - Super Metroid
Truly a body that only a Mother (Brain) could love - xandermartin98
21 Kefka - Final Fantasy VI
22 Amalgamates - Undertale
23 Elder Princess Shroob - Mario & Luigi: Partners in Time
Once she loses 3500 HP, Now she can turn it into 3800 HP! (Whoa! )
24 Master Fortress - Super Smash Bros. 4
25 Clockwerk - Sly Cooper and the Thievius Raccoonus
26 Dark Samus 3 - Metroid Prime 2: Echoes
27 Safer Sephiroth - Final Fantasy VII
28 GLaDOS - Portal
GLaDOS is a fictional artificially intelligent computer system appearing in the video games Portal and Portal 2. The character was created by Erik Wolpaw and Kim Swift and voiced by Ellen McLain.
29 Wheatley - Portal 2
30 Dr. Andonuts - Radiation's Halloween Hack
31 Zero - Kirby's Dream Land 3
32 Mega Mix - Crash Bandicoot: The Huge Adventure
33 Undead Core - Cave Story
34 SA-X - Metroid Fusion
35 Shadow Queen - Paper Mario: The Thousand-Year Door
36 Steroid Joker - Batman: Arkham Asylum
37 Chairman Drek - Ratchet & Clank
Ultimate Supreme Executive Chairman Drek (simply known as Chairman Drek) is the head of the Blarg species and the main antagonist of the 2002 videogame Ratchet & Clank and a major antagonist of the 2016 animated feature film and Playstation 4 game.
38 Icon of Sin - Doom 2
39 Leviathan - Captain Scarlett and Her Pirate's Booty
40 Master Gee - Captain Scarlett and Her Pirate's Booty
41 Giga Bowser - Super Smash Bros. Melee
42 Malus - Shadow of the Colossus
43 Rudy the Clown - Wario Land 3
44 Porky - Mother 3
45 Ignatius Mortimer Meen - I.M. Meen
46 Beast Ganon - The Legend of Zelda: Ocarina of Time
47 Dracula - Castlevania: Symphony of the Night
48 Majora - The Legend of Zelda: Majora's Mask
49 The Butcher - Psychonauts
50 Frank Fontaine - Bioshock