Doo would be significantly less cute if she weren't in a grimdark situation capped off by death.

>>279599260
Aside from the design, the psycho gundam is one of the most badass things in GQuX, she's the most obvious Zeta/Evangelion reference, she's one of the weirdest GQuX characters and has some memorable lines (contrasting nicely against her much more normal MAV), she's got glimmers of humanity despite her inhumanity (like the doll she carries around in her briefcase), and she's got a very vaguely implied uwu so sad backstory.