Cameo fighters from other games. These fighters have no connection to the game's main plot. They are simply guests in the Xeno Fighters R story.
“The Vic Viper (ビック バイパー bikku baipaa) is a guest fighter from the Gradius Series of games by...Vic Viper
“The Pollux (ポルックス porukkusu), formerly the Gemini Red, is one of two guest fighters from the...Pollux
“The Castor (キャスター kyasutaa), formerly known as the Gemini Blue, is one of two guest fighters...Castor