The work was done on a course on character graphics from a knower school.
The course includes finding your own reference, generating a character in makehuman, finalizing a Low-Poly model in a T-pose in 3dsmax, creating UVs and creating hand-painted textures in 3D-Coat, rigging and searching for a suitable ready-made animation in mixamo.
The model can be downloaded from Sketchfab: https://sketchfab.com/3d-models/ninja-79c6a037c4864aeeb170db9feab8e600