Garp is the most basic character out there
Simple minded, laughs off everything, good morals, beats pirates to a pulp, is part of a wicked tyrannical system but is never seen remotely showing signs of any form of ideal or philosophy or questioning the morals of said oragnization. Garp never engaged in any intellectual conversation basically, he is a character driven by superficial emotions, straight as an arrow.
You can consider his plot to be cool and well written but he is in no way a comlpex character lol