I don't like talking about myself so I'm just gonna give out some details.
The best anime/manga/light novel is Tensura, or That Time I Got Reincarnated As A Slime. Frieren is also really good.
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Stories by nyxi
Tensura: Midnight Bonds
Tensura but Rimuru gets a sister. This happens around the time he's preparing for the fight with the Orc Disa...
Tensura: The Diamond Born from Fro...
I add another original character, this time being Guy and Velzard's daughter. That's about it.
Kimetsu no Yaiba: Blood Red Spirit
Demon Slayer, but with my original character named Mayumi Ikari joining on Tanjiro and the group's journey.
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