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Gavin is a red-headed, 14-year-old, and overall quirky and unorthodox human, residing in Waterfall. His clothes consist of a hat and jacket with a pattern of maple leaves and his SOUL embedded in his heart area, ripped jeans, mountain boots and a T-shirt that says "I'm so undergrounded". He carries a satchel too, to put stuff in, just in case he finds anything he might want to keep since his pockets are too realistic. He tries to be a cool person, and unlike the surface, he does end up having a lot of friends. He fell into Mount Ebott when he was 12, he met the monsters and decided to live underground with them.

He became especially fond of the skelebros, most notably for their relatability. From being friends with Papyrus, he was able to become Undyne's friend, and Alphys' too. Since he lives within close proximity to Napstablook, he decided to be friends with him since he felt a bit sorry he felt bad all the time. He also met Lil, who was his live interest and girlfriend, and currently still is.

In the Genocide Route, he is fought as a miniboss before you fight Undyne the Undying, and can command a wide arrange of video game-related attacks, with Mario, Sonic, and Pokemon-styles being some examples. His other weapon is a bat, which is a shout out to Earthbound. If you perform the right order of ACTs, you can steal his bat and damage him more severely. He won't appear in a second run, instead replaced with Lil.

After Lil left him alone for a half of a year, he felt insanely depressed and never left his house for the first two months, only coming out after the third started. She came back though, and he is currently fixing himself to be the way he was before she did.



Napstablook, Sans, Papyrus, Frisk (depends on Route), Undyne, Alphys, Defense, and Jade.


Asgore, Mettaton, Grillby, Dogs (all of them), Temmies, and Slade.


Anyone who he sees as targeting him just for fun/anyone who tries to hurt those he cares for

Love Interest



Gavin does have LV and experience, but it's all below 1, as he's only fought humans before.


HP: 21

Attack: 7

Defense: 1





-Steal [Pleading 3 times, then Challenging 2 times]


"Hey, nice to meet you. I'm Gavin. Rough bump-in with Undyne, huh? Here, you can come to my house if you'd like, so I can tell you about her, and help you out." (Said when you first encounter him in Waterfall.)

"If my bro Defense was here, he and I would have an insane time, I know it! Our other friend's birthday party was unforgettable." (Said when Gavin can randomly call you in Hotland)

"Hey, you wanna see something cool? Here, look at this." (After this quote, he'll show you a SimpleFlips video where he actually gets out of GBJ.)

"Hey, I'm listening to ______. Wanna hear?" ( A random track from the game's OST will play on his headphones. You then can choose to listen or not. Appears in Grillby's, sometime after battling Photoshop Flowey and going to Snowdin for Undyne's letter.)

Encounter (Genocide-only)

His fight encounter happens on the Genocide run only, if you ever enter Temmie Village. On the Neutral and Pacifist runs, he automatically befriends you in Waterfall, after dodging all of Undyne's spears on the zigzag bridge. He lives in a house only accessible in a room across from the Temmie Village that can only be opened by completing the piano puzzle and having the Annoying Dog steal the artifact.

"I know idiots like you, and I hate them." [Fight Start]

"Don't give me that bullsh*t. It's too late." [Plead]

"SHUT UP!" [Plead 2+]

"I'll do it!" [Challenge]

"JUST DIE!" [Challenge 2+]

"My bat, crap!" [Steal]

"...(cough) is how it ends...why did I expect to defeat you? I just ruined the chance to have a happy life.....and now my family and friends will never see me again.....I hope you're happy..." [When you defeat Gavin on the first run]

Flavor Text

You face a pro gamer! How pathetic. [Fight begins]

Gavin glares at you. [Randomly after turn]

Gavin is sweating. [Randomly after turn]

Smells like memes. [Randomly after turn]

Woah, smells like technology. [Randomly after turn]

You tell Gavin that you will end his life, and he gets angry. The attacks are faster now. [Challenge]

You tell Gavin that you can fix things by resetting. He doesn't believe you'll do that. [Plead]

You feel a wave of regret....or do you? [After Plead]

You took his bat. [Taking his bat]

You wonder what you can do to him with this. [After keeping his bat for 4 turns]

You're just the devil now, aren't you? [After keeping his bat for 5 turns and over]


On the Undernet, Gavin has an account by the name of sanicspeed21. He occasionally will post status updates, and often is found on the roleplay boards, or playing a game unidentified by the Undernet.

He has actually tried to convince Alphys to try making a console like the Xbox 360/Xbox One that has a live system that you can play, message, and talk to people, sort of like an underground Xbox Live.


  • Gavin's favorite video game is Mario Kart 8, as of now.
  • Having been around the internet, he also uses a wide range of internet memes whenever.
  • Gavin's soul automatically being Blue references his favorite gaming genre of platforming, and his favorite color. It's also a bit Purple, of course due to his personality. So his soul could be considered Indigo.
  • Gavin has a thing for instruments. His favorite and only is his keyboard, which he will sometimes play when you enter his house.
  • Gavin is the only character in the game that when cussing, has symbols replace a letter or two.
  • Gavin has a cell phone that you can call. You can attempt to steal it, but he will always be there to take it back.
  • Gavin's favorite movies are the Back to the Future movies. He actually once asked Alphys if she had any time travel movies in her collection, but sadly none there was, meaning no BTTF.
  • Gavin also loves YouTuber SiIvaGunner's high quality video game rips. He'll constantly listen to them and reference some of the memes used on the channel. Some are even used in his attacks.


Theme for when you fight him: Type in GAVIN

Theme in general: Superman - Goldfinger


Credit to @Slade the Demon for both the inventive drawings and support.

We all know who Toby Fox is, don't we?

And credit to the makers of ButtonBass for those epic cubes!

Credit to Goldfinger for the awesome song!


Spooky's rendition of myself.