Havent checked the scp lore in some time aswell, tho if i remember correctly its design is mostly predetermined (wolf skull etc) but its not rlly dangerous (i think), Mal0 is just scary at first is all, and gives u hallucinations eventually, but i think once u get used to them u have a new friend :3
Correct, however for Sakura, Mal0 is actually neither male or female, i brushed up on an incident file, some people name their mal0s and grow to live with them but some are unlucky and go insane bc of their mal0. There's different mal0s too, the two i know of as of right now (i haven't read more than one of the files as i'm strict on time in my life) is they show up in your actual view or appear in reflections. you can fact check me, i don't know the entirety of mal0's lore by heart.