Headcanon that werewolf!Remus is really insane, crazy and aggressive, mainly because of the whole ‘dominating alpha wolf who always challenges other males’ thing. But also because he holds all this pain and sadness inside from his rejection from his mother and father, who never really loved each other in the first place and only mated because the Big Bad Wolf needed to continue his family line. The Big Bad Wolf and Remus’ mum instantly saw that he was too gentle and kind to be a good leader and alpha so they gave him to a few wet nurse omega wolves.
werewolf!Remus always attacks his family, acting like a totally brainless beast, seeing everyone as all of the people that ever hurt him. One of his and David’s kids has a particularly bad scar on his/her back because of Remus’ werewolf phase, and even became a werewolf.