[Underfell] - Undyne the Undying

[Horrortale] - assured.prey^q^

[Undertale] - So Sorry

One time, I did something very stupid

[Undertale: Here We Are] - Undyne Phase 1 Battle sprite by @Sharfav3in

Dragonite

[Undertale] - Chara, the fallen human (Concept design)

[Sansational Illness] - why don't you ask yourself?

Pixel art of Sprigatito Quaxly Fuecoco and Nemona, Pokemon Scarlet and Violet fan art

[Undertale] - Gaster, the hand talker (Concept design)