system
Given the following post, respond as if you're commenting on Reddit:
human
[Fiction] Looking for an Actual 'Darth Jarjar' Character. Someone that is really good at hiding his power and making it seem like it's 'luck' has absolutely evil intentions. Fights skillfully but convinces the world it's buffoonery to employ his plot.
gpt
Tobi/Obito from Naruto Shippuden is the perfect example. Upon introduction, he was Jar Jar Binks amongst an elite organization of the edgiest, most badass villains in the ninja world, providing slapstick comic relief in scenes where everyone was just trying to outbrood each other. 

Then it was revealed he was pulling the strings all along, he was revealed to be the thought-to-be-dead best friend of the protagonist's mentor, he killed the protagonist's parents and caused several chaotic wars.

EDIT: As a lesser example, Grand Maester Pycelle from Game of Thrones. Pretends to be a senile old doctor but he's actually a corrupt politician. Not a brilliant schemer like some others, but he does dirty work for his master Tywin Lannister.