The supporting character's harem is very normal - Chapter 349 Saki’s revenge - The Demon Lord appears

Cultivating his power by slaying demons and taming countless beasts, the emperor solidified his throne as the world's ruler. But not once in his life had he expected that his disciples would use research on demonology to sap the world tree's power and push the world to destruction.Trying to fix his mistake, he opted to use all of his cultivated power to cure the world tree and block anyone from sapping its power ever again. But in exchange, he was to lose all of his power.But...the worst had happened, his wife... had betrayed him.

Mu Yue traveled to the world of Naruto and became an ordinary chuunin teacher at Konoha Ninja School and a member of the Root Organization.

Fortunately, after awakening the teacher system, you can become stronger by teaching.

In order not to become Danzo’s consumables, Mu Yue worked hard to teach and increase her strength.

“Complete the teaching rated A for the first time and receive the reward – mastery of fire attribute chakra properties change.”

“Under your guidance, Uchiha Shisui has worked hard to practice, and his overall strength has been greatly improved, and he has been rewarded – the Immortal Human Body!”

Under Mu Yue’s guidance, Zhishui understood that the village’s enemies were not necessarily other big countries, but could also be within the village. People who spoke righteously about the will of fire might not necessarily act in accordance with the will of fire.

Obito got rid of the title of being the weakest person in the ninja school, and Metkai became a master of physical skills even earlier…

- Description from novelbuddy

Xuanyuan was reborn into a strange new world where training to be a Xian was a cornerstone. There was however something ancient dwelling inside his body. He could now devour all of creation…

This is the journey of an ordinary boy and his transformation into the supreme being that reigns over all existence! Everywhere he went, he could not help but tie his fate with numerous women. It did not matter whether they were a goddess or a devil…

- Description from Novelupdates

Shu Yu has passed through the book, and has become a poor cannon fodder who was implicated by the dead female supporting role and only appeared twice and was finally exiled for thousands of miles.

After finding that he could not change the result, Shu Yu decided to eat, drink, lie down and wait.

Who knew that the exile had not yet come, but she was suddenly told that she was not the daughter of the Shu family.

Her biological parents were peasant households who lived so hard to make ends meet that their house was leaking.

And the Shu family decided to obliterate her in order to hide her blemish.

Shu Yu: Come on, I can’t kill you.

Returning to his biological parents, Shu Yu finally sighed as he looked at the plate of pickles and a bowl of porridge on the table and placed in front of him, as well as his parents’ nervous and bewildered expressions.

You can’t lie flat, or you’ll starve to death.