The only apps I'm familiar with aside from Medibang are Ibis Paint X and Flipaclip though the later is more for animation that illustration that I've seen.
After a quick search I found Autodesk has an app version of it's drawing software Sketchbook but it's relatively limited for the free version of the app and it's likely the same for Adobe's Photoshop Sketch and Illustrator Draw apps.
I know that Medibang has a few more options available to users if you sign up a Cloud account but I hope you're able to find something you like