This is, by far, my absolute best custom.

Inspired by EniamRej's Penance.
Started with a Captain Marvel base, and a shaved down Winter Soldier head (didn't have any SHIELD soldiers). Sculpted all of the armor, the belts, and the helmet. I didn't feel like swapping heads back and forth, so i made the helmet removable.
The spikes are from those Floss pick things.
Painted with Testor's acrylics, and sealed with Plaid seal spray.
Hope you like him! Enjoy!

RECIPE:

Base: ML Series 15 Captain Mar-Vel
Head: Winter Soldier
Spikes: Oral-B Floss picks

Sculpt: Aves Apoxie
Paint: Testor's Model Master acrylics