I am that male friend in the harem story - Chapter 67: Ishigami: "I want to go home."

Zhou Donghuang, a man from the Earth, is able to destroy any planet in the universe without lifting a finger. His supreme will can sweep across the vast cosmos in the blink of an eye. And his immortal spirit can depart from his body and wander around the universe!

In Kunlun Mountains lies a circular slate, which brought him back to one thousand years ago…

- Description from Novelupdates

Is a flower demon with three hundred years of cultivation.

Shao Zi’s biggest wish is to beat up that egghead Scholar (shu sheng) that always comes to water plants at noon.

But when she got close and rubs her hands in preparation for action, she realizes that she’s clearly playing along to someone’s rhythm ah!

- Description from Novelupdates

Traveling to the future interstellar where Wu is respected, Robbie concealed his awakening ability in order to avoid intrigue.

Unexpectedly, someone who doesn’t have eyesight has to look for things. The cousin first robbed her fiance, and then she wanted to rob her. Robbie ran to the test in a rage, but the result was shocking…

- Description from novelbuddy

Karl Adelheit, a self-proclaimed ordinary student returning from military service.

And a nobleman who enlisted as a soldier and received Medals of Honor.