This is a Undertale Sprite Studio

FINISHED:
Frisk (a.k.a The Human)/Chara
Toriel
Flowey
Napstablook
Froggit
Whimsun
Loox Eyewalker
Vegetoid
Dummy
Sans
Papyrus
River Person
Grillby
Jerry
Lesser Dog
Greater Dog
Annoying Dog
Monster Kid
Onion-san
Nice Cream Guy
Mad Dummy
Temmie
Undyne
Woshua
Alphys
Mettaton
Muffet
So-Sorry
Vulkin
Burgerpants
Mettaton EX
Mettaton Neo
Royal Guards
Asgore
Whimsalot
Omega Flowey (Photoshop Flowey)
Lemon Bread
Reaper Bird
Gaster Blaster
Asriel
W.D. Gaster (Mystery Man)
Heart Soul
Battle Actions
Battle Backdrop
Speech Bubbles
Temmie Flakes
Weird Toriel

UNFINISHED:
Green Flame Girl
Heats Flamesman
Snowdin Shopkepper
Snowdin Librarian
Snowdin Innkepper
Snowdog
Blue Bear
Ice Wolf
Scarf Mouse
Bratty
Catty
Duck
Mushroom Dance
Gerson
Clamguy
Clamguy 2
Donut Guy
Dress Lion
Migosp
Moldsmal
Snowdrake
Snowdrake's Dad
Chilldrake
Icecap
Gyftrot
Doggo
Dogamy & Dogaressa
Aaron
Moldbygg
Shyren
Tsunderplane
Pyrope
Final Froggit
Astigmatism
Madjick
Knight Knight
Glyde
Memory Head
Lemond Bread
Endogeny
Snowdrake's Mom
Moldessa
Parsnik
Migospel
Big Mouth Guy
Charles
The Robot
Doge
Diamond Guy
Diamond Guy 2
Puzzle Hater
Scarf Lady
Elevator Sad Dragon
Coffee Dude