But Jar-Jar was highly consequential, and not pointless at all. He was a delegate to the Senate, and he wanted to make a difference. As such, he took it upon himself to speak to the Senate, to grant Chancellor Palpatine emergency powers. You may argue that anyone else could have done that, but I'm not so sure; it seems like one of those things that many may support, more or less in quiet, but nobody wants to take the initiative, as they are too careful and political to do so.
As such, he is the reason for the fall of the Republic and rise of the Empire.
Completely pointless character that I love for that exact reason.