who is the deltarune chapter 5 secret boss

The Chapter 5 secret boss is Pink , according to multiple recent guides and discussion posts about Deltarune Chapter 5. The boss is typically unlocked by collecting Pink Coins and using the Mystery Key to open the pink door.

What players are saying

Recent coverage points to the same name:

• Guides from June 2026 identify the secret boss as Pink.

• One guide says you need at least 10 Pink Coins to buy the Mystery Key and reach the boss.
• Forum discussion also describes the hidden boss as Pink , sometimes linked to Mad Mew Mew in fan discussion.

Unlock path

The reported route is:

1. Collect Pink Coins across Chapter 5.
2. Buy the Mystery Key from the shop.
3. Open the pink door near the end of the chapter.
4. Enter the side path to reach the secret boss.

Note

There is still some community uncertainty because Chapter 5 discussion is very new and a lot of the info is coming from guides and forum posts rather than an official chapter guide. But the strongest current answer is Pink.

TL;DR: Chapter 5’s secret boss is Pink.