Mecha Alliance | ART COMMISSION OPENさんのイラストまとめ

The pilots (excluding 2 OG characters). 1 is a familiar face named G-Guy (they aren't even trying to hide), next is Daikuuji Gaioh (Daikuuji is obviously Daikumaryu reference, and Oh also means King, so you can connect the dot). The last one is self-explanatory.

One of the most obscured units in Muv-Luv franchise, the Hinokagutsuchi is the strongest TSF to ever exist. It appears in the game Ayu Mayu Alternative, which includes a lot of parodies of other series like Saint Seiya, Getter Robo, Gaiking, etc...