Procyal

Constant Spells — A constant spell affects the monster without the monster needing to cast it, and its duration is unlimited. If a constant spell gets counteracted, the monster can reactivate it by spending the normal spellcasting actions the spell requires.

Change Shape (concentrate, divine, polymorph) — The procyal can transform only into a specifc individual Small or Medium humanoid that they've met at least once. They can't transform into a generic member of a given ancestry.
The monster changes its shape indefinitely. It can use this action again to return to its natural shape or adopt a new shape. Unless otherwise noted, a monster cannot use Change Shape to appear as a specific individual. Using Change Shape counts as creating a disguise for the Impersonate use of Deception. The monster's transformation automatically defeats Perception DCs to determine whether the creature is a member of the ancestry or creature type into which it transformed, and it gains a +4 status bonus to its Deception DC to prevent others from seeing through its disguise. Change Shape abilities specify what shapes the monster can adopt. The monster doesn't gain any special abilities of the new shape, only its physical form. For example, in each shape, it replaces its normal Speeds and Strikes, and might potentially change its senses or size. Any changes are listed in its stat block.

Raccoon's Whimsy — Procyals' core value is whimsy, though unlike for chaotic tricksters, procyals' playful actions have a pattern and their pranks always come with a valuable lesson, even if it takes a long time to decipher the meaning. Receiving and growing from such a lesson requires at least 10 minutes of interaction with the Procyal but can take much longer. A character who learns from the procyal's lesson gains the benefits of the Aid reaction from the procyal once during the next month. Afterwards, they become immune to this effect from all procyals.