Top 10 Undertale Character Parallels

The Top Ten
1 Almost literally everything about Alphys (Francis - Super Paper Mario)

Well, except for the fact that Alphys is actually cute (heck, I'd even call her hot), which Francis...really isn't, to put it lightly.

2 Papyrus' sassy and overconfident attitude, nasally voice, and fancy clothing (Skeletor - He-Man)
3 Frisk having a split personality entity that tells them to kill and destroy things (Fei - Xenogears)
4 Burgerpants being the dejected, grumpy laughing stock of his burger-joint workplace (Squidward - Spongebob Squarepants)
5 Papyrus being Sans' taller, thinner brother who is comically obsessed with spaghetti (Luigi - Super Mario Bros.)
6 Alphys being quite possibly the cutest little dinosaur ever (Yoshi - Super Mario Bros.)
7 Omega Flowey being a horrifying eldritch abomination that serves as the Neutral Run's fourth-wall-shattering final boss (Giygas - Earthbound)
8 Undyne's immense strength and hot-headed attitude (Erza Scarlet - Fairy Tail)
9 Sans being the main mascot of the game as well as Papyrus' shorter, stouter brother (Mario - Super Mario Bros.)
10 Alphys being incredibly adorkable yet also kind of evil at the same time (Peridot - Steven Universe)
The Contenders
11 Alphys being quite adorkable yet also a shockingly dark character once you really get to know her (Otacon - Metal Gear Solid)
12 Chara having an incredibly sadistic smile on her face as they chaotically murder and destroy everything in sight (The Joker - Batman)
13 Sans being ridiculously obsessed with ketchup to the point of outright fetishism (Pikachu - Pokémon)
14 Chara being an evil god who feeds off of innocent life and treats it as their playthings while also possessing Frisk's body (Zanza - Xenoblade)
15 Flowey being an evil psychopath who eventually overthrows one of the secondary villains and becomes the main villain (Dimentio - Super Paper Mario)
16 Endogeny being THE most nightmarish and terrifying dog in existence...yet still just a dog at heart (Cerberus - Greek Mythology)
17 Sans wearing a blue hoodie and cracking bad one-liners as if he literally gets paid to do so (Carlos - The Magic School Bus)
18 Asgore wearing thick metal armor, wielding a large glowing red weapon, and being sort of the main protagonist's father (Darth Vader - Star Wars)
19 Frisk's and Chara's hair (Dora - Dora The Explorer)
20 Papyrus being the cutest, nicest skeleton you'll ever meet (Jack Skellington - A Nightmare Before Christmas)
21 Flowey being so cute that you just KNOW he's going to be the villain the second you see him (Lotso - Toy Story 3)
22 Mad Dummy summoning a knife and throwing it at you in a fit of psychotic rage (Dio Brando - Jojo's Bizarre Adventure)
23 Sans being a smug, wisecracking, sharp-shooting douchebag with a crush on the main female royal figure of the game (Han Solo - Star Wars)
24 Sans being a funny, charming and lovable douche with a tendency to somewhat break the fourth wall at times (Deadpool - Marvel Universe)
25 The Amalgamates being horrifically failed genetic fusion experiments with a theme song titled "Amalgam" (The Gem Clusters - Steven Universe)
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