UNDERTALE/Alphys

Overview
Dr. Alphys is a female, reptilian monster that lives in the lab in western Hotland. She is the incumbent Royal Scientist, a position she was awarded by Asgore after the disappearance of her predecessor.

Apperance
Alphys is a yellow, reptilian monster of similar height to the protagonist. Her posture is somewhat hunched over. She has yellow scales, claws, and protruding teeth. Her feet have three toes while there are three fingers and a thumb on each of her hands. Her "hair" is designed into points facing the back of her head.

Personality
Alphys is shown to be shy. Like, REALLY shy. Fluttershy has nothing on her (if anyone gets the reference) when it comes to that. In some neutral routes, due to her shyness or other events caused by losing Mettaton, she becomes more reclusive or even goes as far as suicide (possibly by letting her body be melted by the Amalgamates and their determination in the True Lab). Other than her shyness, she is a HUGE nerd.

Pacifist Route
After the quiz show Mettaton gives, Alphys upgrades your phone and proceeds to help the player get through the Hotlands. She doesn't do this intentionally, due to the fact that she hates giving the answer outright, but she updates her status with the answers until she realizes you've been reading them. She is the one who calls everyone to the Barrier. She states that a little flower helped her. ... Uh oh.

Neutral Route
It's the same as the Pacifist Route unless you are aborting the Genocide Route in the Hotlands.

Genocide Route
The True Lab is inaccessible due to the fact that Alphys hid everyone there. She doesn't know that Mettaton is still up there...

True Lab
The True Lab is the only place in-game where Chara's history is found (other than the flashbacks in Asriel's battle). When the protagonist returns to the lab, a note from Alphys lays on the ground in front of the "bathroom." The note directs the protagonist to the True Lab's entrance to discover the truth, in case they do not hear from her again.

The protagonist learns about Alphys's Determination experiments in the True Lab via consoles on the walls that have her lab entries on them. She isolated determination from the six human SOULs and injected it into monsters who had "fallen down" in an attempt to extend the longevity of their SOULs after death. None of the monsters died, and they were well for a short time before they melted together. Alphys's lab entries explain that monsters lack the physicality that humans have, and that this is why the monsters fused together; their bodies could not handle high concentrations of determination. She did not tell anyone about the Amalgamates and feared hurting everyone's feelings.

As the protagonist reaches the power generator, Amalgamates approach and trap them. Alphys stops the Amalgamates and explains that they were "sassy" because they were hungry. Alphys then tells the protagonist that she had a change of heart and will tell everyone about her failed experimentation. She then leaves the lab and returns the Amalgamates to their families.

Trivia

 * Alphys is an anagram of "shy pal"; this could be where her name came from.
 * It is also possible that Alphys's name was derived from the word "alpha," or the dominant leader of a group. This could allude to her role as the Royal Scientist.
 * Her name can also come from the word physics, given her role as a scientist, and how scientists study physics.
 * When attempting to name the Fallen Human "Alphys," the response becomes "D-Don't do that." and prevents the name from being used. However, naming the fallen human "Alphy" gives a confused "Uh.... OK?" and is allowed.
 * Before the protagonist enters the True Lab, there is a note in the trash can that reads "I KNOW WHAT YOU DID." Flowey may have written this note to push Alphys to reveal her secrets.
 * Alphys is the only major monster in the game who the protagonist cannot fight and, therefore, kill.
 * This causes her true combat capabilities to be unknown.
 * The only way to see her fight is in Asriel's battle, where she uses Mettaton's attacks, or by hacking, which crashes the game, due to Alphys not having attacks.