Say hello to Parallelogram! I know what you're gonna say... technically there are already two other "parallelograms" in the comic, but hey, this is the only parallelogram with a capitol "P".
One fun thing about Parallelogram is that he is the first character (other than Pi,
if you count it/him/she?) that does NOT have vertical symmetry (as in, he does NOT reflect on the vertical axis). That means, unlike the other shapes, you can actually tell which direction he is facing! Note how you can tell that he's turned around to leave in the second to last frame of the comic. It's like a whole new world of art! The term "new" here is of course used very loosely.