Nick Fury - from the Toybiz Spiderman Animated series, works great with the Marvel Legends Nick Fury backpack and smoke trail accessories.
Mandroid - this custom was part of my CustomCon 17 entry (along with a HYDRA Dreadnought). I used a X-Men Evolution Juggernaut base figure, Classic Light-Up X-Men Juggernaut head, Marvel Legends Omega Red shoulder pads and tentacles (for the hoses), Spiderman Electro accessory for left hand weapon and X-Men Phalanx accessory for right hand weapon.
G.W. Bridge - The SHIELD commander comes from the Toybiz X-Force series 1.
