War of Universe

What if the multyverse really exists? And God created a system that could select random candidates to play a game that would thrill the multyverse. A young man who has a penchant for fantasy stories is suddenly selected by a system that makes him a teacher in multyverse war. The system gave him the authority to select several characters in the series he had read for his students. In addition to making him have students from the character fantasy he reads, he is also required to compete with other selected candidates like him from other multyverse. which characteristics will he choose as disciples, and how will he teach them? read the rest of the story in the War of Universe.