The title the Fool was unlocked by completing the J-mod collection list during the 2019 April Fools event. It was also available by claiming it from Dr Cole for a cabbage boson during the 2020 April Fools event.
This title changes according to the language of the server on which RuneScape is played, as shown below:
||[Name] der Esel
||[Name] le Crédule / [Name] la Crédule
||[Name] o Tolo / [Name] a Tola
|This information has been compiled as part of the update history project. Some updates may not be included - see here for how to help out!