i really recommend Snarlbear by Natalie Riess, it was completed recently and is really short. from the website:
SNARLBEAR is a comic about a girl’s journey through the dangerous and colorful Rainbow Dimension. On the way she learns about the power of friendship and monster punching.
Namesake by Megan Lavey-Heaton and Isabelle Melançon is another really good one, it’s currently ongoing and is pretty long but it’s worth a read. here’s an excerpt from the about page on the site:
The rules of Namesakes are quite clear - Alices always go to Wonderland. Wendys always go to Neverland. However, Emma finds herself in Oz, where she is expected to act as the latest in a long line of Dorothies. She instead unveils a magical conspiracy plot that’s more than 100 years in the making.
and finally, Never Satisfied by Taylor Robin is another ongoing comic about kids and magic.
Never Satisfied is the story of apprentices competing for the position of magician representative for their city, serving directly under the king. There’s no greater job for a magician, so who could want more?
Never Satisfied features characters that are non-binary, and use the pronouns they, them, and their. When in doubt about which pronouns to use, pay attention to what other characters use, or you can look at the cast page for the main characters.