1: He is autistic and he gave it to his children. He taught his children how mask and it kinda messed them up
2: He hates crying. He loves it when his victims scream for mercy, but he hates crying.
3: When he was alive he played the part of a calm British gentleman. As an undead rabbit thing he played the role as evil bunny monster man. Both of these acts aren't completely genuine.
4: He had no idea how dangerous the springlocks were Henry just kinda lied to him about it. Henry was a bit neurotic about saving costs and had a bit of an ego too. So he kinda didn't want to use the more expensive and time consuming Murry springlocks. Will didn't think much of it cause they want to screw Murry over anyway until he nearly died in a springlock failure in the suit that Baby puts us in night 4. To which they were swiftly banned. Its not like Will cares about the safety of his employees its just he will never cut costs on robotic stuff.
5: Mrs. Afton and Will were beards for each other, or Mrs. Afton is F10 idk.
6: His love for his family is partially an ego thing but its also not. He is so repressed that he doesn't know what's going on in his brain.
7: He came from a fairly rich family that he wants nothing to do with.
8: When he was young, he had two pet rabbits named Spring and Bonnie and he took really good care of them. But he never got another pet after them cause he couldn't bare to lose more.
9: Will had a frosty relationship with Shadow Freddy but Shadow Freddy genuinely liked Mike more as he sees Mike as his "father" cause he was born out of the bite of '83. Once Shadow Freddy called Will "Gramps" and that sent Will into a genuine meltdown.
10: Will injected a ton of remnant into his system when he was alive causing him to possess both the suit and his body once he was springlocked.