Isaac thinks he understands Blue's loneliness and tried to help fill his big sister's family-shaped void not knowing she already has a family in their older half- sister Roxanne. Unfortunately, her real feelings of loneliness come from her inability to have a lasting relationship with a man, something Isaac can't help her with. Isaac still tries to be a good brother to Blue and moved in with her to bring some stability into her life... unfortunately, Isaac fell in love with Joy, Blue's roommate. Isaac still is worried about his big sister and tries to help her in any way he can.

Back in the late 1980s, Isaac's dad fell in love with Blue's mom, but all he was to her was a built-in baby-sitter for Blue. Even before Isaac was born the two had broken up... forcing Isaac's father to leave Blue behind. Isaac always knew he had a sister, but after his father remarried she was never spoken about again. Isaac felt he was to blame for the way Blue ended up and decided he would do his best to make things right with her.

Isaac isn't the brightest of people, but he's honest enough. He fell for Joy quickly, but his immaturity has been a problem for the two. Blue isn't thrilled by the idea that Isaac and Joy like each other, but has given up trying to sway them. Isaac was one of Charles's students (unfortunately for him, knowing Charles outside of the classroom didn't make the time in class any better for him). He talked about transferring, but never did.

Not much is known about his high school days, but he went to the same school with Murray and Bendly (Cedric's former comic assistants and friends) and thought they were his friends. It wasn't mutual; they were jealous of how he got the ladies with his indie cred charms, and they didn't. Isaac is still oblivious to their dislike of him and considers them good friends. 

Isaac does have a bit of nerdish charms on his side, almost subconsciously seducing Falco into liking him. The two went out, despite his conflicting feelings for Joy. Unfortunately the two of them were never more than friends (that made out), and the two ended their relationship coldly. His feelings were still just for Joy, and in the end his feelings were returned.

He has a very jealous streak to him, and can be harsh with other men. With women, he can be a bit unintentionally flirtatious... which I'm sure comes from his mother's side of the gene pool. He also willingly goes along with the group, which could mean he's a bit of a follower, or a poser. He purchased a rather pricey doll to fit in with Joy and Falco, but seems to enjoy the hobby with them.