Thunder Skrull is a Super Skrull type character based on the Secret Invasion story from 2008. It was made by swapping a 2 Pack Super Skrull head onto a partially repainted Beta Ray Bill figure. The second hammer is from a Blob series Thor.Not sure where the cape came from.
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.