Up to now this expression has been impossible to duplicate in real life. This official DELTARUNE plush sleep mask was designed by Eyes5. It's about 7.5 inches long and 4.5 inches tall laid flat, and made from soft micro-minky and terry cloth fabrics.
DELTARUNE - Lancer Sleep Mask - Fangamer
DELTARUNE - DELTARUNE NPC Sticker Sheet - Fangamer
Thanks Toby, sleeping has never looked scarier. (From new Deltarune fangamer merch) : r/Deltarune
DELTARUNE RELEASE DATE ! : r/Deltarune
Fangamer adds Undertale and Deltarune merch to celebrate 8th anniversary – Nintendo Wire
DELTARUNE - Queen Boss Battle - Fangamer
DELTARUNE - Spamton's SPECIL Fun Pak!!! - Fangamer
DELTARUNE - Jevil Talking Plush - Fangamer
DELTARUNE - Cyber City Lanyard - Fangamer
WHAT IS THIS LOL : r/Deltarune
DELTARUNE - Nubert Embroidered Beanie - Fangamer
Fangamer adds Undertale and Deltarune merch to celebrate 8th anniversary – Nintendo Wire
Lancer, Deltarune Wiki