If i remember it, i once (or multiple time) have read the manga on this site. So here the some detail i remember.
1. The first manga is your typical fantasy where the MC become the main villain of his world, the MC is a black skeleton. Iirc the reason why the skeleton is black is because of the miasma or something i hardly remember it.
2. The MC on this second manga is female, the story is she got reincarnated to the game she once play and want to change the original plot of the original story. The one point i remember is she is the granddaughter of yakuza (or mafia? i forgot). Oh yeah and she have a red hair.
And that the vague detail i remember about the manga, sorry for the lack of detail i provided
. Hope any of you help me search the title. 
1. The first manga is your typical fantasy where the MC become the main villain of his world, the MC is a black skeleton. Iirc the reason why the skeleton is black is because of the miasma or something i hardly remember it.
2. The MC on this second manga is female, the story is she got reincarnated to the game she once play and want to change the original plot of the original story. The one point i remember is she is the granddaughter of yakuza (or mafia? i forgot). Oh yeah and she have a red hair.
And that the vague detail i remember about the manga, sorry for the lack of detail i provided