Honkai: Star Rail: The Second Trailblaze

Reader advisory: No transmigration, multiple arcs, a male lead who grows up over the course of the story. The protagonist has always been the same person, and Xiao Qiong and Qiong are one and the same~

After the Trailblazer (Qiong) had traveled to countless places, he perished alongside Nanook. The unique Stellaron he left behind brought Xilian here from the past. About six years later, Xilian found a familiar-looking, but much younger, Xiao Qiong on Earth (?)...

Xiao Qiong has had a hard life. Not long after boarding the train, he encountered the Aeon of Slaughter, and the fates of Xiao Qiong and Qiong began to intertwine...