Naruto: The Outsider's Resolve - Chapter 2.8 (039):

(This is a dungeon core story!)Sylvan is a nymph. A nymph who had lived his entire life protected by a barrier. Hiding the fact that his tree was a dungeon.But now, someone took off the barrier! Tourists are besieging his tree, cutting off branches to use as presents!He has only one option left before him: he must use the mind-altering mushrooms which he grows near his dungeon tree to stop people from chopping his tree down!And it just so happens that he knows how to cook with a flare!Follow him as he feeds those who want to cut off his tree, brainwashes them, and finally levels up his dungeon.This was not a romance story... but then the kind vampire appeared, and the MC lost his heart.

Descent of the Phoenix – 13 Years Old Princess Consort

The strongest female assassin from a special assassination force met her death one day on a mission. To her surprise, she woke up in the body of a 13 year old girl, Mu Rong Liu Yue. Through Liu Yue’s past memories, she found out that she was bullied due to the huge birthmark on her face, even though she came from a renowned family. Liu Yue was beaten to death by her own cousin, and that’s how she managed to enter Liu Yue’s battered body. The assassin then decided to live her life as Liu Yue and swore to avenge her death.

- Description from Novelupdates

Nolan transmigrated into the Marvel universe and became a researcher at Hydra's lab.He awakened the talent of the “Master of Research,” allowing him to perceive and comprehend all truths and knowledge. His body harboured the power of the Spirit of Evolution, capable of absorbing everything to enhance his strength!From the very start, he developed the Super Soldier Serum and that was only the beginning.By studying various extraordinary individuals, he unlocked their abilities and seamlessly integrated them into himself.“I will use science to recreate the gods of Earth and bring Superman into the Marvel universe!”Wolverine's healing factor?“Wolverine, you've already been dissected once. One more time won't hurt!”Super strength? “Hulk, don’t leave!”An iron body? Heat vision? The power that grows by absorbing sunlight? “X-Men, stop right there!”He will make the Ultimate version of Superman!

When I cleared the final chapter of a game that was a national failure, I became an unnamed side character in it.

A non-standard, unmeasurable, EX rank supporting character.