Mildred
Several gifs (notably parts 18, 22, 25)
tileset assistance for Hotland, banner, trial backgrounds, some help with sprite poses (Undyne, RG 02 back, Frisk and Papyrus hug in part 24b), additional tile help in Undyne's lab, cutscene slide assistance for part 1 dub, Moonlight Mettaton overworlds
E-Clare
Mettaton overworld base, Undyne overworld base, misc sprite touch ups, tileset assistance (Forgespring), assistance with Sans' armor
Fours
Fort Aquarius tileset, Dohj sprites, Dohj dialogue, some assistance with MTT resort tiles (sidewalk), assistance with Alphys battle sprite
SoupTaels
City tileset for Hotland
Mr. Epic
Base tiles for Undyne's lab, Presents in the Past (song), probably some other stuff I'm forgetting, aaa
Chip Potato
additional tiles for Undyne lab, overworld sprites for Astigmatism and Muffet
Nora
Base overworlds for Asgore, front sprites for Knight Knight, RG01, RG02, Sans overworld face base
Merol
Undyne spears for the trial, some misc Hotland sprites, help with tuxedo Undyne throw animation smears
Electric Sparks
a ridiculous amount of animation. Animation for the dub, Undyne fight, assisting with the trial animation
Waffl'm
Base for revamped Papyrus overworlds
PineWithSun
Soundtrack contributions (Trio of Troublemakers, Ditchin' Foes, Battle of the Ages), enemy design for the CORE
Tadpole
Text for the Moonlight Mettaton segment (NICE bubbles, etc), fireball sprite in Hotland
Z-nogyroP
Many soundtrack contributions (Seeds of Friendship, the news themes, the MTT style unnecessary tension)
Jimmythebassist
More soundtrack contributions
ThomasThePencil
Soundtrack help
Deka
Home of Frighty Spooks
Master of Toast
Ain't Afraid, mixing help with Fighting for Your Life
Keno
Mixing help on V1 of Stars Collide!
LucasPucas
skeletwo., Fort Aquarius
datudou
the weapon sprites in undyne's lab
PineWSun
Many NPC sprites in Forgespring and the MTT Resort Restaurant, Ice cap base sprite for the trial
Philiplol
Scratch Programmer
Gosha-nyan
Russian Translation
Szkraft220
Waterfall Borders
SmartCellist1
Soundtrack contributor
DashingToadie
Soundtrack contributor
Beethovenus
Writing assistance and brainstorming
Cake
Programming on various IF Projects
Bokke
Programming on various IF Projects
Soufon
Assets for UndyneOS
SuperKirbyLover
Various art assets, including some tilesets, cutscene artwork, and character sprites.