Ahh, I remember post-its... Those were fun. One teacher made us do an essay that was ten pages (I wound up doing 25 because of how interested I got), and in the bottom right corner, I did a doodle. 2nd page went to top right. Third to top left. Bottom left, bottom right, etc. If you looked through the pictures right, you'd see me hitting my head on a wall repetitively from writing so much. Hahaha!
Yes, ambidextrous would be the easiest to draw, wouldn't it? Nora is ambidextrious, and Kornith has taught himself. Besides those two characters, I try to make a character seem one-hand dominant. It's difficult to remember, though ><