Irritable ghost
What have I got to say to YOU!? Nothing!!
Like I'd even recognize a pathetic face like THAT!Irritable ghost, Chapter 2
The irritable ghost is an unseen Lightner in Deltarune, residing within the Blook house in Hometown with the nobody and Napstablook. They are the counterpart of the ghost that inhabits the Mad Dummy/Mad Mew Mew in Undertale, sharing their angry temperament and tendency to repeat words three times in escalating volume.
The irritable ghost is short-tempered and abrasive. They are quick to anger and express their frustration through loud, escalating outburts. Despite their hostile demeanor, they occasionally appear flustered when caught off guard as seen when asking Kris to say hi to Asgore for them.
In Chapter 2, the irritable ghost is heard from the other side of the nobody's door, irritated that the knocker might be looking for Napstablook, who is not there at the time. If Kris answers they are looking for irritable ghost, they call their face pathetic, and let slip that they should say hi to Asgore for them. If Kris answers they are looking for "Someone Else", they can speak with the nobody.
In Chapter 5, the irritable ghost appears in the Flower King Dark World as the Shadow Crystal boss. They take the form of Pink, who resembles Mad Mew Mew and can be battled after purchasing the Mystery Key from the Shop at the Cliffs to unlock the pink door in Flower Castle.