Cosplayer Jechts recently constructed a costume from One-Punch Man. He went with Genos, a teen cyborg that follows Saitama. He assembled several screenshots from the show for reference and got to work on templates. The hand armor was especially intricate because of all the armor segments for each knuckle. Jechts started with Iron Man MK III Pepakura files as a base and altered them to fit a Genos design.
Once the foam armor was done, Jechts tackled lighting. He used LEDs and said:
This week has been a blur of wiring, smoothing out details and cleaning up Worbla pieces, wiring some more, cutting out and bending acrylic to be used with bond paper to diffuse light, and more wiring.
A pic showing the wiring in progress is included below.
A detailed overview of the costume, including notes on the LED circuit:
Watching a video showing off the lighting on the Genos costume here. You can find more WIP photos of the Genos build in this Facebook album.