There is a new android painting program called Medibang Paint. It is similar to LayerPaint HD, but is geared more towards comic creation. The UI can be customized too. It has seven basic brushes: pen, pencil, watercolor, blur, crosshatch, airbrush, and finger smudge. You can sign up for an account with Medibang Paint and download around a 100 free extra brushes. Some of these extra brushes are pastel, flat brush, oil, acrylic, sumi, and more. You can make more brushes by changing individual brush settings and saving them as new brushes. You can adjust the opacity, size, and mixing properties.
Medibang Paint has layers, layer blending modes, clipping masks, selection tools, transform tools, gradients, different color pickers, a text tool, and snap to guides. One of Medibang Paint's more unique features is the ability to make comic panels. You can make them any size you want. You can also download pre-made comic style backgrounds and comic style effects. You can make canvas sizes up to 10,000 X 10,000, but it seems to be unstable to export images for anything over 6,000 X 6,000 pixels on my Samsung Galaxy Note Pro 12.2.
You can create an account and sign up with Medibang to become a publishing partner where they offer services to publish your comics. They will even translate them into other languages and publish them on Kindle and Google Play. Medibang Paint is free to download and also has a Windows version and an IOS app. Overall, this is a very interesting app and has a lot of features. Medibang Paint is sort of like the Windows program, Manga Studio 5, but isn't quite as complex.
This is the full UI of Medibang Paint
Here is the Medibang Paint link for their affiliate program.
This is the cleaner UI with the alternate HSV color picker.
Here are the extra brushes.
Here are some of the downloadable materials.