Reborn, I Turned My Little Sister into a Valkyrie

[Reborn + System + younger sister + partly behind the scenes] In his previous life, Su You chose the Hero System and embarked on a lonely, exhausting path of heroism. In the end, he was betrayed and died, his soul extinguished. After being reborn, he chose the Overlord System. He decided to live for himself and make up for how he had failed his younger sister in his past life. With the Overlord System, Su You created many Valkyries, each with unique abilities. One is a cybernetic sword immortal Valkyrie, clad in dazzling armor, who can send countless silver swords flying with a wave of her hand. One is a Reaper Valkyrie, wielding a black scythe to reap souls. Another is a Celestial Master Valkyrie, dressed in a fitted Daoist robe and controlling the Eight Trigrams and Five Elements formation to create a world of her own, and so on. With Su You pulling the strings, a game designed to deceive the entire world is about to begin! What does “partly behind the scenes” mean? The protagonist appears in the spotlight, but few people know his true identity. The entire story revolves around him. If there’s a female lead, it’ll only be his younger sister. Everyone else is just a supporting character and a tool.