Jacques is Jon's pet bird, who is portrayed as a robotic comedic relief, and a foil to Jon.
Jacques is a green cheeked conure parrot. He has his wings clipped, meaning that he cannot fly. This results in his frequently falling from whatever he is standing on. Jon loves his bird, and regularly kisses Jacques.
Jon has owned several other birds over the course of JonTron. Most have been featured in very small roles on the show.
Jacques is used as comedic relief, usually by insulting Jon. He also has a robotic voice, flashing red laser eyes, and many other strange abilities. He has been able to wipe people's memories and teleport.
Jacques was originally going to have a Persian accent, but Jon found the robotic voice to be easier to make.