The universe of Warhammer 40K is savage. Discord user anactualfox747 has created "The Krystal Korps", a set of T'au fighters made up of AI remnants of the former Star Fox team, with Krystal remaining alive as the leader of their advanced mecha squadron. According to anactualfox747's story, the yellow figure contains the AI copy of Fox McCloud, though he has gone crazy. Krystal saved survivors of an invasive force in the Lylat System, while the rest of the Star Fox team stayed behind to help their escape. That's why Krystal is the only survivor.

You can see that the mechs and vehicles have Krystal's tattoos and coloration for the most part. The Krystal head for the lead unit is a modified and 3D printed version of the Krystal bust by Kagekitsoon. Anactualfox747 did all the painting himself.

Thanks to anactualfox747 for the photos and info on his project.