There is old games like Phantasy Star 1 to 4 on Genesis using icons, lot more clear and intuitive at first sight, instead of words (golden sun on GBA also and lot of others)

Well dod as you like laugh
But for a begin, it's a solid base you have there :
Menus, character portrait, 3D tiles and grid.

you'll just need good characters classes.
What will you choose :
- Making all characters on your own
- Buying some on 3D sites like Dexsoft
- Buying or creatign a base character, and adding armore stuff yourself to make the different classes of the game ?
- Using sprites ? (why not , but i really prefer 3D characters smooth moves)

Keep the good work.