This is the first boss enemy you encounter.
Who is Toriel?
This is the son of Asgore and Toriel.
Who is Asriel?
This is the character that has you use the blue soul.
Bonus if you get both.
Who is Papyrus/Sans?
This is the race that declares war on monsters.
Who are humans?
This is the theme of Sans on the genocide route.
What is Megalovania?
This character is only mentioned by five other characters, that spawn by a luck stat (aka the FUN stat.)
Who is W.D Gaster/Royal Scientest Gaster?
This is the ending where you explore Alphys' True Lab.
What is the Pacifist Route?
This is the first enemy you fight in Undertale, regardless of the route you play.
Who is Flowey?
This is how the Amalgamates were created.
What are the Determination Experiments?
This is one of the themes Mettaton uses in his battle
Bonus if you get all three.
What is Metal Crusher/Death by Glamour/Power of NEO?
This is a mad ghost character who transformed into a dummy and then transformed into ___ ___ ___/___ _____.
Bonus points if you guess both names.
Who is Mad Mew Mew/Mad Dummy?
This is normally the fastest route to play.
What is the Genocide route?
This is one of the special fights that you fight in the genocide route.
Bonus if you get all four.
What is Glad Dummy/Undyne the Undying/Mettaton NEO/Sans?
These are the two characters that the shopkeeper in Snowdin says "just appeared one day."
Who are Sans and Papyrus?
This boss in Waterfall's theme is a remix of a song of a boss in the Ruins.
Who is Mad Dummy?
This Amalgamate has a pre-existing monster's name in it's name.
Who is Snowdrake's Mother?
This route always ends in you doing a reset.
What is the Genocide route?
This is the only character that shares a soul type with a Deltarune boss.
Bonus if you can also get the Deltarune boss.
Who is Mettaton/Spamton NEO?
This is what Sans calls you if you kill Papyrus.
What is a 'Dirty Brother Killer'?
This special theme is only held by a secret boss.
What is 'Wrong Enemy!'?
This character is encountered in a locked away room where the key is only obtainable through no-hitting the special credits fight in the pacifist ending.
Who is the Annoying Dog/Toby Fox?
This is the route that has the final track 'Good Night'.
What is the Genocide/No Mercy route?
This is the only canon soul color that is not used in any battle.
What is the soul of Patience?
This is one of the four weapons that goes with one of the fallen humans.
Bonus if you get all four.
What is the Worn Notebook/Gun/Stick/Frying Pan.
This game has a remix of Megalovania.
Bonus if you get all four.
What is the Earth Bound Halloween Hack/Homestuck/Cognitive Dissonance/Super Smash Bros. Ultimate?