Do you have any headcanons about Casey’s family?
I do have a few! :D
His little sister's name is Angelica, but she goes by the nickname Angel. She's 10 years old. Their dad's name is Arnold.
Casey’s black and white hockey mask belong to his dad who played hockey in college.
Angel is much like her brother: Reckless, stubborn, but she’s more logical than Casey. She can be very ruthless and also clever when it comes to insults. Angel is also a part of her schools junior roller derby team. She can be a sore loser when things don’t go her way, but she’s also is very kind and loves her big brother, despite all the times she teases him. She will kick your kneecaps in if you hurt her family.
Casey and Angel's parents are divorced. Their mom had an affair when Casey was 13 and Angel was 7, and she left the family for her affair partner. Their father has full custody of the kids, but Casey and Angel often visit their mom on weekends, who lives out of state (Whenever there are episodes that Casey is not in I HC that it's because he's visiting his mom).
Casey resents his mom for breaking up their family and hurting his dad, but Arnold wants him to continue to have a relationship with her mainly for the sake of his little sister who's not fully aware of why her parents spilt.
Arnold is a workaholic, doing extra shifts at his job to make enough money to help take care of and raise his kids. This results in Casey having to stay home and look after Angel, becoming a second parent to his siter instead of being a brother.
Angel is a very nosey child, so she grew suspicious of her brother when he would start coming home late covered in bruises. It didn't take Angel long to figure out that her brother is living life like a vigilante. Arnold put the pieces together too, Casey wasn't subtle about it. The two agreed to not confront Casey about it for they saw how happy it made him, and decide to wait for him to be ready to tell them about his vigilante life.
It's after the fight with Tatsu in season 5 when Casey is sent to the hospital and his family visits him that he confesses exactly how he got injured. Arnold tells his son he's always known for he himself went through a similar life when he was young (like father like son)
The vigilante thing wasn't a surprise. The mutant turtle ninjas thing was an absolute shock for both Angel and Arnold.
Arnold thinks Raph is a good influence on his son (ironically Splinter thinks Casey is a bad influence on his boys lol), he believes Casey is less likely to get in trouble if he hangs out with the Turtles.
