How can i add 3D characters on


how can i add 3D characters on the example isometric engine for example add a 3D Minda

As diana mentioned, actual polygonal 3D is not possible.

Minda is a 2D isometric sprite with 8 directions worth of animations.

If you have sprites that can display in all of those directions, you can do the same. However, everything in that tutorial/demo is just 2D sprites.