John Wick is the long lost brother to Radioactive Uber Clan member Felix the Cat. He is one of the 20 legendary assassins, just like his younger brother who was also raised by an assassin named "Death".
He was thought to have died during the 50th Impact War. This upset Felix greatly and he mourned his brother every day. During December 2020, Felix the Cat got word of someone fighting Soviet Steve. It was his long lost brother, John Wick.
Ecstatic, Felix grabbed his Sniper Rifle and came to Wicks rescue. the two of them reunited and had a chat before fending off Steves evil demon army.
Felix requested John to join the RUC but he declined, saying he has revenge to be done. Felix doesn't know what John Wicks want to avenge but he gave them the RUC phone number in case either needs each others help.