It's the Skrull with the base Fantastic Four's powers, the Super Skrull Kl'rt. This one was a taxing one to get together. Base is the standard Skrull Soldier from the Marvel Universe line. The rest is cobbled together from other MU figs - left arm is from Thing, left leg is Iceman's (to simulate Sue's invisibility powers), and the fire is from Ghost Rider's head. I also used part of the leg that I removed from him to simulate the stretching powers of Reed.
The figures contained in the Custom Showcase are not for sale by Figure Realm, and the creators of the customs are no way affiliated with Figure Realm. The Custom Showcase is purely for entertainment purposes and only provides a means for the creators to show off their work and trade ideas. Figure Realm does not make or sell customs.