What are the liberty needs of a body that has ever been desecrated by tattooing, marking, branding, piercing or any other method of human disgrace? Do the bodies deserve special altered burial? Will the soul have special atonement or more important daily prayer to endure such a life?
A person that desecrated his body, did something that he shouldn’t of done. However like all sins, we can do teshuva and the sin is atoned. There is nothing special that i am aware of that has to be done. Regarding removing the tattoo, there is no obligation to remove them.
Shevet Hakehosi 5-154, R’ Ovadia Yosef zt”l, Mein Omer vol. 7 chapter 3-4.