MTL - Immortal Martial Venerable - Chapter 6090 one to four

In 2040, The Earth was bathed in powerful radiation when a star went supernova, this radiation granted 50% of humans superhuman abilities but also created a nightmare for them as animals, insects, and carnivorous plants were mutated and became overpowered with intelligence, human started teetering on the brink of survival, a boy with no powers and no father, with a mother in a coma, seems destined for obscurity, but one night changed his life, with a new found hope to cure his mum from the everlasting sleep—Gene Elixir— he went on on a journey that would reshape his destiny...~Voracious Sovereign... Gene Devourer...Pray you won't be devoured by this power you wield which hunger is insatiable~~You call yourself an opportunist... But... you aren't free. A hungry man is not a free man...~

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

It is well known that while most Evil Skills can be mastered quickly, they are accompanied by immense side effects. A slight misstep and you could drive yourself insane or get yourself killed.But what if the side effects could be transferred to your enemies? How exhilarating would it be to cultivate Evil Skills then?In any case, Zou Feng, who transmigrated here, is already having the time of his life.The most evil, most venomous, and most morally corrupt Cultivation Skills? Bring them all on.This Poison Skill will make your entire body fester and become unrecognizable? Cultivate it!Cultivating this Skill will cause you to lose your sanity and become worse than a beast? Cultivate it!A Cultivation Skill that ensures you won't live for more than a year upon mastery? Cultivate it!

An old man dies, torn by regret. Due to his high karma, he has “near-limitless possibilities for reincarnation”. He chooses to reincarnate in a fantasy world as a voluptuous futanari succubus with big tits and an irresistible smile.