Harem

"I Can't do this anymore!" Yuke Feldia, a red mage, just left his adventurer A-Rank party. After being mistreated as a handyman and ridiculed for five years, he finally snapped! And so began his desolate, unemployed life or so he thought!
Through a stroke of luck, Yuke is welcomed into an all-female adventurer party comprised of his former students!! As they defeat dungeons one after another, Yuke's strength is gradually revealed! As it turns out, this red mage wields extraordinary magic and skills?
A party of the protagonist who is a skilled supporter x newbie

Alexander, whose hometown was destroyed by the demon race, fought with the Demon King and was killed. But instead of the afterlife welcoming him, when he opened his eyes, he was reborn as the Demon King’s son, Jilbagias!? While hiding his true identity, he stains his hands with atrocities as he conducts himself as the ideal demon prince, increasing his power to ultimately overthrow the Demon Kingdom…

A magic nerd's life came to an end after a dreadful encounter with the nobles who ended his life with a powerful spell. His last wish, being able to study and master more magic, has been answered when he was reincarnated as Lloyd de Saloom, the 7th prince of Saloom Kingdom. Now he'll be able to perfect his magic as he pleases...
I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability
I Was Reincarnated As the 7th Prince so I Will Perfect My Magic as I Please
The Seventh Prince: A Reincarnated Magic Nerd

Nigris, an adventurer who has a rare “appraisal” skill and specializes in “healing magic”. He supported the S-rank party behind the scenes, but was deemed incompetent and exiled. Nigris begins his career as a solo adventurer with a fresh start, but his destiny begins to change when he meets the elf slave girl Fels and the thunder master Alisa. "Wha, what is this power...!" Nigris' talent blooms, and they demonstrate incredible power! Together with her trusted companions, Nigris will make a name for herself as an adventurer.

What would happen if the mightiest being of all time reincarnates himself as Villager A?
As the Demon Lord, Varvatos leads a life where nobody dares intrude in his personal space. Desperate to find friends, he takes matters into his own hands and reincarnates 3000 years later as Ard Meteor, your regular nobody born in the boonies.
But little did he know, magic has vastly degenerated after his passing, and what was considered average magic power during his lifetime is now considered never-before-seen talent!

Abel was a genius magician who held immense power in a world where the color of your eyes indicates how powerful you are. However, the strength that came with his amber eyes was so great, even his comrades looked at him with fear and contempt. He therefore decided to transfer his soul far into the future, hoping to find a paradise that accepts him. He would soon find out that people’s attitude regarding his eye color did change, but not quite the way he had imagined…Associated Names
Rettougan no Tensei Majutsushi - Shiitagerareta Moto Yuusha wa Mirai no Sekai wo Yoyuu de Ikinuku

In this world, It’s only me who can get stronger by eating Magic Stones! At one point, I received an offer to have a smooth life reincarnation from the Goddess-sama… But the skill I got as a prize is Toxins Decomposition EX. Ugh, what a plain skill! Its so pitiful that even my own family makes fun of me… However, one day I realized that because of this skills effect, I can eat and gain power from Magic Stones! I’ve also been notified that I’m the prince from a neighboring country!?

Before I realized, I had become the guardian of a dungeon, a Demon Lord. I was suddenly in a dangerous world with giant monsters loitering around, fighting for their existence, so I thought to go about developing the dungeon in order to not die but —- for some reason I was having quite the good time…. How did it turn out like this?

The protagonist, Yuki, having to live in that world now, uses his bold and sharp senses and spends time with a supreme dragon girl and a vampire girl; Sometimes laughing, sometimes being angry, passing days doing what he likes

One typical school day, Tsukuru and his classmates got transported to another world. On the other side of the summoning, there was a hero's auction, where each nation bid to take home the heroes to defeat the demon kings of each territory.

While his classmates received cheat jobs and got auctioned off quickly, Tsukuru got the useless job, "Chef." After no nation bid for him, he got thrown out through a transfer gate. On the other side of the gate was a territory dominated by strong monsters...

A boy, Allen-Lordle, who is despised as "Rakudai Kenshi" by his surroundings. One day, he decides to leave the sword arts school and duel with his classmate, the genius swordsman Dodriel. While despairing for an unwinning battle, Allen happened to get a "100 million year button." !? It is "one hundred million years pressing, bound to the world of the time," was the button cursed