Same thing as Atom, a commissioned Ref Sheet.

Mark has a, storied 20 year life. From being disowned and left on the streets for 5 years, to being kidnapped and used as a genetic experiment for 10, to finally finding a home with people who truly care for him with Kipo and the others, and even finding a romantic relationship with a certain wolf girl he managed to save, he’s lived through a lot.

Notable experiments:
His DNA was infused with wolf DNA
His heart was replaced with an artificial one
His blood was genetically modified and is now blue, and doesn’t actually register as blood but rather as a complicated set of chemicals
After attempting to put him to sleep, every pressure point on his body is capable of knocking him out.