Backstory: He is always sees the positive side of things, even when there seems be no hope he finds something. One day he stumbled upon some ancient ruins and finds some more people, you should know the rest. If not go to the previous Elemitrix.
I really like the transparent dark blue on Jaka, it’s not a colour you usually see lots of in mocs.
The lower legs look awkward though and the lower arms look a bit bare.
Overall I really like Jaka, and I think it’s one of your best mocs so far