[Underfell] - Gaster

[Underfell] - Papyrus Royal Armour

[Terraria] - Golem

Undertale, but nothing's wrong.

[Underfell] - Asriel Dreemurr

HELLESCAPE - Comma Animations

[Slay the Spire] - Gremlin Nob

[Underfell] - Asgore

roaring knight playing guitar

[Undertale] - 10th Anniversary: Don't Forget