Femmes in the Fridge keeps a far-too-sporadically updated list of 200+ child or teen-appropriate comics & graphic novels recommended by myself and others, available here in excel format.
(I, and before that we, have intended to turn it into a webpage for…the entire existence of this site. I, and before that we, are not great at css, and wish we hadn’t been steered away from the computer sciences in school. I therefore do not recommend holding your breath on that one. But hey, it could happen!)