For the maybe two people who aren't as deep in the warhammer weeds as me and anon >>11490868, there's three modern Fulgrim minis. A Pre / Early Heresy humanoid and a later heresy demon version in resin from forgeworld, and a recently released plastic demon version to represent his current form.

1, which was half of a diorama with the Iron Hands primarch Ferrus Manus, somewhat infamous for the screaming face and there being a different sculpt lost somewhere.