Update [8/30/16]: A while ago, I created a crossover between Undertale and Steven Universe. Just to let you all know, I am a HUGE fan of both of these; they're both great, and I respect people's opinions that would declare otherwise. In the reviews' section, I've been getting good constructive criticism like how it's too short or how it escalated too quickly, the plot that is. I thank you all for that, and the others that say it's pretty good. But to let you know, I sorta expect people to just get a good laugh off of this because I consider this crossover as a "though-that-counts" type of thing; though, it does depend on the individual's liking too. Also, the month I created this crossover was literally the exact month I was introduced to Undertale and started to absolutely love it; so I may have messed up on some parts because it really didn't feel like the character or something. I knew Steven Universe ever since its first episode came out, so a pretty long time. But yeah, I love both of these.
I will be really amazed if you actually read through the whole thing. [I hope you didn't expect me to talk about a fraction of both of the fandoms above, though. Some are really nice people and/or individuals, but a lot of which of both fandoms can be absolutely rubbish.]^
Oh, and Steven Universe is a show that has quality-with-quantity, respectfully in my opinion. I mean seriously, the Summer Adventures was amazing and it lasted almost always everyday for four weeks! Oh, and Undertale's a great game too.
Steven Universe along with the other five Crystal Gems - Garnet, Pearl, Amethyst, Peridot, Lapis Lazuli - were scouting around Beach City to look for any sort of Gem shards around to bubble. Little did they know a person named Frisk and its monster-companions would come to Beach City - and for what?
Garnet began explaining their plan. "Peridot and Lapis, you two will look for the Gem shards by the ocean. Amethyst and Pearl, you two will look around the city. Steven and I will take a walk looking for anything. Got that?"
"Yes, clod!" Peridot said with a goofy smile. The team soon split up.
Steven and Garnet were looking around the temple, talking to each other about Lapis Lazuli and Peridot. "It's nice to see them two get along with each other," Steven said.
"They're lucky," Garnet said. "Usually, Gems would clash with each other in hatred because both of them dislike each other. Peridot was forgiven overtime, and it's indeed good to see them get along."
As they were talking, they stumbled upon a large hole. Inside they could see monsters smiling at them; Garnet jumped down to see who they were while Steven followed. "Hello there," Sans spoke out. "These are my friends - pacifist Frisk, brother Papyrus, and others."
"Howdy!" Steven said. "Could you, um, fill the hole?"
"Sure," Frisk answered.
They then filled the large hole and the Undertale characters were glad to see the sun. They all became friends, and everything was cool.
The End.