Semi Frequent Undertale Factsさんのイラストまとめ

* The roguelite dungeon crawler Going Under has a character called Zans who is a skeleton and wears a blue hoodie, this character references Sans the Skeleton.

Submitted by: @MisterJelliott
Game: https://t.co/NDnL4cqeAl

* In DELTARUNE, Toriel mentions a fighting game referencing Smash Bros that Kris and Asriel used to play. Toriel also mentions how Asriel loved "the green lizard" when he was young, making Asriel a "Yoshi" Main.

* The XBOX version of Undertale has an exclusive Casino Border once you upgrade the Dog Shrine one time. Said border has various Deltarune characters hidden in it.

Submitted by: @CJ_PLUS_3 and @KlubHimself

* For Booster Pack 5, a Co-Op Sans Baby named "Funny Baby" was added to the indie videogame The Binding of Isaac.

Submitted by: @Z33Z1A
Help from @MisterKaze

* Asgore is the Santa Claus of Monsterkind, leaving presents under every tree at night, this is confirmed by the Santa Claus clothes he has and by him (kinda) where he explains how his now deceased friend, Rudolph Holiday was "his Rudolph the Reindeer".

* Normally, Burgerpants has an 'M' on his hat, however whenever he smokes, the letter changes to a W. This may or not be a reference to the Spongebob episode "Mermaid Man and Barnacle Boy IV" where something similar happens.

Submitted by: @BlaizeMayes

* Gerson explains that when a Boss Monster (like Asgore) has an offspring (Asriel with Toriel in this case), the parents' soul power flows into the child, making both age, however if a Boss Monster doesn't have or loses them, they are stuck at the same age.

* Running into Photoshop Flowey's pellets during his speech after all of the soul phases will annoy him.

Submitted by: @time_stables

* For Undertale's 5th Anniversary, Famitsu made an article with lots of different scenarios with new official sprites for the Undertale Cast. Here are said scenarios upscaled.

Credit goes to: https://t.co/8uCSU5EPFD