The secret boss of Deltarune Chapter 5 is reported to be Pink in multiple recent guides, though one major guide still lists the identity as unknown. So the safest answer is: Pink is the currently reported secret boss, but the spoiler scene is still being covered inconsistently across sources.

What the reports say

  • A guide from Games.gg says Chapter 5’s secret boss is Pink and describes unlocking the fight through the Mystery Key and Pink Door.
  • Mobalytics also frames Chapter 5 around Pink Coins needed to unlock the secret boss.
  • Another Chapter 5 boss guide still labels the secret boss as Unknown , which suggests some guides are either outdated or avoid naming it directly.

Quick scoop

If you just want the name people are using right now, it’s Pink.

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