Loox
Please don't pick on me.
Loox
Loox (JP: ルークス) (/ˈluːks/) is a monster encountered in the Ruins. His Hard Mode and CORE counterpart is Astigmatism.
Loox is bipedal and has two horns on the top of his head, a large eye on his face, and teeth under his eye.
Loox does not like it when people pick on him, though is also a bit hypocritical in that he also picks on other people (as suggested by flavor text when encountering a Loox and another enemy.) His description in the True Pacifist ending credits implies that he is less of a bully, and a "reformed bully" if the protagonist does not pick on him.
"Loox" is a corruption of looks. Both his first and last names allude to his single prominent eye. His full name, Loox Eyewalker, is a pun that references Luke Skywalker, a prominent character from the Star Wars franchise.
The Library Loox is an NPC in the Snowdin Library, who comments on the protagonist's choice between the Junior Jumble or the crossword being more difficult.

A Loox replaces the Boss Monster next to the human in the Undertale Demo intro sequence and the intro played before Omega Flowey's battle.
- Loox makes five small spheres appear from either side of the bullet board, which move and bounce around the board while slowly gaining speed.
- After selecting "Pick On", the spheres are faster than normal.
- Loox makes several small sphere-worms appear from either side of the bullet board, which wiggle their way forward and disappear when hitting the edge of the bullet board.
- After selecting "Pick On", these sphere-worms become more abundant and are faster than normal.
- Choosing "Don't Pick On" allows the protagonist to spare this monster.
- Picking on him does not allow the protagonist to spare him, but it awards five extra EXP. However, if a Loox has an EXP value of 20 or more, picking on him does not increase his EXP value, which allows for a maximum of 24. This can be used to get extra EXP and thus making upcoming battles easier.
- Any given instance of Loox starts out with a reward of 7 EXP. "Don't Pick On" reduces the EXP reward by 2 if the EXP reward is greater than 4. "Pick On" increases the EXP reward by 5 if the EXP reward is less than 20 and if that instance of Loox is not spareable (spareability from ATK does not count for this). The amount of EXP that can be earned is 3-24 depending on the protagonist's actions.
- In order to get 24 EXP from Loox, perform the following ACTs:
- Pick On x3 (7 + 5 + 5 + 5 = 22)
- Don't Pick On x4 (22 - 2 - 2 - 2 - 2 = 14)
- Pick On x3 (14 + 5 + 5 = 24)
- Please don't pick on me. [Neutral, first turn]
- Quit staring at me. [Neutral]
- I've got my eye on you. [Neutral]
- How about a staring contest? [Neutral]
- Don't point that at me. [Neutral]
- What an eyesore. [Neutral]
- You rude little snipe! [Pick On]
- Finally someone gets it. [Don't Pick On]
- Don't pick on him. Family name: Eyewalker [Check]
- Loox drew near! [Encounter]
- A pair of Loox decided to pick on you! [Encounter with another Loox]
- Loox and co. decided to pick on you! [Encounter with Vegetoid and Migosp]
- Vegetoid and Loox attacked! [Encounter with Vegetoid; unused]
- Loox is staring right through you. [Neutral]
- Loox is gazing at you. [Neutral]
- Loox gnashes its teeth. [Neutral]
- Smells like eyedrops. [Neutral]
- Loox has gone bloodshot. [Neutral; unused]
- Loox is watering. [Low HP]
- Loox doesn't care about fighting anymore. [Spare conditions met; unused]
- Loox's idle animation is faster when picked on. The animation reverts back to a normal speed once "Don't Pick On" is chosen.
- Loox's line "Please don't pick on me" is a direct quote of the pumpkin-head ghost boss from the game Monster Party, who says this line immediately before attacking.[3]
- Loox's appearance resembles Mike Wazowski from Monsters, Inc. and the Ahriman from the Final Fantasy series. Relatedly, the overworld sprite of the Library Loox is called
spr_npc_mikewazowskiin the game files. - Loox was the first enemy to be designed by Temmie Chang.[4]
| Version tag | Changes |
|---|---|
| v1.001 | Fixed a glitch in which Loox's EXP increase when picking on him would stack indefinitely, allowing thousands of EXP to be gained from a single kill. |
- ↑
Don't pick on him.
— Check narration
Family name: Eyewalker - ↑
Loox gnashes its teeth
— Battle narration - ↑ "A bully eyeball monster named Loox appears in the Underground. In the English script, Loox says in battle:
- Please don’t pick on me.
Toby pointed out in his translation notes that Loox’s line is actually a direct quote from the 1989 NES game, Monster Party. In this classic retro game, a pumpkin monster says “please don’t pick on me” when the player enters its lair." — Clyde Mandelin, Legends of Localization Book 3: UNDERTALE, pg. 92 - ↑ UNDERTALE 10th Anniversary Stream - Day 1 (01:23:33) on YouTube