Hey they're back.
For starters : Reiji, since Endless Frontier, is a walking reference to Rom Stoll from Machine Robo : Revenge of Chronos.
His intro in the game is the exact same, he got the same voice actor too. His has this habit of shouting WAIT ! when he does his intro and does a speech about virtue and justice while saying his enemies don't deserve to know his name, he does this so much it's almost a meme.
https://www.youtube.com/watch?v=WAqWK6i6AHMAnd both Reiji and Xiaomu, since NXC, are inspired too by Kyosuke Nanbu and Excellen Browning ( Subordinates of Sanger Zonvolt, who is in PXZ himself. Hilarity ensue when you put them in the same team. ) from Super Robot Taisen.
Kaguya Nanbu ( Who as the same nickname as Sanger "The sword that smites evil" ) and Haken Browning from Endless Frontier are inspired too by Kyosuke Nanbu and Excellen Browning, leading to hilarities with Sanger too. Check it out.
I could try to list all the returning playing characters from NXC but that would be long.