So I just got a lamp from gearbest (https://www.gearbest.com/outdoor-lights/pp_378424.html?wid=1433363) and rigged up a new lamp stand for a totoro sized 150mm. You´ll have to take that thing apart and cut the solar panel to its edges which is about 64mm on each side. Also cut the battery pack to its edges (59x20mm). Then cut all the wires, put the parts in place and solder everything together. Last just put the Totoro on top and you´re done.
It´s not the most aesthetic solution, but I think it´sstill a nice gimmick. Let me know if you have a better way to do this, now enjoy ;)
Printed the hollow Totoro by Joo with Glow in the dark filament at 50 microns, took about 13 hours. I wanted to gift it as a sort of night lamp so I designed a little stand with space for a solar panel and battery pack, Totoro sits directly on the panel with the two LED´s and the light sensor. So now it charges at day and the light turns on automatically when it gets dark.