The supporting character's harem is very normal - Chapter 534: Mom, I need time...

Known as the country’s top onmyoji, Yuuma Kisaragi, who lived to the age of 99, awoke to find himself in an unfamiliar forest. A voice echoed in his mind, revealing that he had been reincarnated into another world at the age of 20.“Good morning, Master. Skip the greetings and please defeat the goblin in front of you.”The voice belonged to a skill acquired during reincarnation called “AI,” designed to assist Yuuma in his new life. When the skill, AI, took over the form of a golden-haired fox yokai, the familiar shape of Yuuma’s shikigami, he decided to embark on a new life alongside AI-chan.The onmyoji and AI-chan’s second life began, tackling various challenges and formidable enemies with the strongest spells and shikigami.

Bob is someone that hate people who praise Lord Buggy D. Clown as the strongest being on One Piece alongside God Usopp. His hate suddenly bring him to his death and even worse, his soul got transferred into Lord Buggy's body. How will Bob live as our Lord and Saviour Buggy?

In the face of Thanos and his crowd of alien warriors, Jerry took out his wand:

“Avada Suomin”, “Shenfeng Wuying”, “Fuchsia”, “All Petrochemical”…

Withdrawing the wand, pressing both hands on the ground, a huge alchemy formation was formed on the ground, and countless gun barrels roared like thunder.

Get up and put your hands together, the Dragon Slayer Profound Magic is activated, “Red Lotus Exploding Thunder Blade!”

…

Traveling through the Marvel universe, Jerry gets a bizarre panel that rewards Little Red Star for doing good deeds.

Consuming Little Red Star can go to other magical worlds to learn magic,

Consuming Little Red Star can also refresh your mind and speed up the efficiency of learning magic.

In order to protect himself and his family, Jerry reluctantly embarked on the path of constantly doing good deeds to earn a little red star, and working hard to study and learn magic.

The protagonist’s three views are upright, not a virgin, no brainless, no system, the panel is only responsible for traversal and refreshing, all magic is acquired by the protagonist through learning, and powerful through research.

- Description from novelbuddy

Xia Zhijun got the title ‘study god’ after scoring first place in the whole city. He’s the model of a good student in a teacher’s eyes: good grades, good manners, and quiet. When he wasn’t smiling, his entire body emits a cold abstinence aura. The girls only have the guts to look from afar and not get close.
Later, it was rumored throughout the entire school that even the study god would fight and hit on girls. Whoever dared to provoke his girl, he would teach you how to be a person at every minute. The night of the graduation ceremony someone saw him blocking Gu Siyi in the corner. He didn’t stop kissing even when she cried. He bit her lips and said in a raspy voice, “I’m going crazy…”
During college finals, Gu Siyi almost bursted out crying, “I’m such a failure. I won’t be able to find a good job in the future…And if I can’t find a good job, I can’t provide for myself…”
Xia Zhijun played with her pink earlobe and remarked, “I’ll take care of you.”
After they graduated, Xia Zhijun created a research company and Gu Siyi became the boss’s wife.
The commercial rocket, “Star of Siyi” was successfully launched. So everyone knew that the new technology superstar, Xia Zhijun has a wife who he spoils a lot.

- Description from Novelupdates