1 Dr. Eggman/Robotnik (Sonic Series)
Doctor Ivo "Eggman" Robotnik is a fictional video game character and the main antagonist of the Sonic the Hedgehog series, created by Sega.
Eggman is the obvious choice for first place on the list, being the big bad of the series and has been trying to defeat Sonic ever since the very start. Eggman quite the eccentric and inventive villain, creating his own minions by himself - that'll save on worker fees.
The rivalry he has with Sonic is the same as Mario and Bowser, DK and K. Rool, Link and Gannondorf, and so on.
2 Metal Sonic (Sonic Series)
Metal Sonic is one of Eggman’s fastest and most powerful creations. Programed to be better than Sonic in any aspect possible, he can shoot electro balls, shoot electricity downward, do a boost, and make himself invincible. He fight’s Sonic each time he gets stronger, and when he gains enough power, he becomes the Metal Overlord. But he becomes an advanced phase of himself before becoming the Metal Overlord. And Eggman can’t keep him under his control all the time, which is the only downside about him. He can morph and shoot lasers, and fight Sonic no matter what, even when disobeying Eggman. Even when you are on his side, you must cry out for mercy when he encounters you.
Metal Sonic is Eggman's creation and Sonic's main counterpart. Metal Sonic surpasses Sonic in everything he does and has gotten so close to defeating him, but the blue blur just won't give up.
3 Father Balder (Bayonetta)
Balder is Bayonetta's own father - that's gotta hurt.Balder is the CEO of the Ithavoll Group, having become evil after trapping the soul of Aesir. He appears as a boss in both games.
4 Akira Nishikiyama (Yakuza Series)
5 Shadow the Hedgehog (Sonic Series)
Shadow the Hedgehog is a character who appears in the Sonic the Hedgehog series released by Sega. He is an artificially created black and red hedgehog whose hover shoes propel him at extreme speeds that rival those of Sonic.
he's not a villain anymore o.o
6 Gouji Rokkaku (Jet Set Radio)
Oh I'm gonna fid a demon record probably doesn't exist but imma look for it anyway
7 Aesir (Bayonetta 2)
8 Zavok (Sonic Series)
9 Dr. Bad Boon (Super Monkey Ball Series)
He was in 1 game and wasn't any good anyways. he also had a stupid crush on meemee for some reason.
10 Eclipse the Darkling (Sonic Series)
11 Wizeman the Wicked (Nights Into Dreams)
12 Queen Slug for a Butt (Earthworm Jim)
13 Fang the Sniper (Sonic Series)
14 Reala (Nights into Dreams)
15 Kaiser Greedy (Ristar)
16 Dr. Machino (Awesome Possum)
17 Lord Dark Demon (Dynamite Headdy)
18 Mr. X (Streets of Rage)
19 The Sorcerer (Alex Kidd Series)
20 Warhead (Vectorman)
21 Dark Raven (Billy Hatcher and the Giant Egg)
22 Max D. Cap (Decap Attack)
23 Anti-Funk (Toejam and Earl)
24 Psy-Crow (Earthworm Jim)
25 Captain Bernard (High Seas Havoc)