Blooregard Q. Kazoo: "Bloo" for short, he's Mac's best friend. A wise-cracking, obnoxious & selfish blue door-shaped blob. He was left at Foster's after Mac was forced to give him up, but he's the only Friend whom isn't up for adoption as long as Mac visited every day. He very often gets into trouble because of his mischievous mind and attention-craving ego. Bloo is the self-appointed member, more than once, he's tagged along to kick Raptor butt, especially when he wasn't invited. He wears a red mask, white cape & a big backwards "B" on his chest and make-believes he's a superhero. Many times, he's helped & other times he's gotten in the way.

 

Wilt: A tall, red, imaginary friend with a stubby left arm and a crooked eyestalk. Wilt enjoys basketball and is generally very easy-going. He will always aid a friend in small tasks, prides himself on rescuing abandoned friends, and sometimes helps Frankie around the house. His defining aspect is his sense of fair play and good sportsmanship, which he applies to every part of life he can. He was adopted by Sara, but she was forced to give him up since the landlord doesn't allow Imaginary Friends. So, Sara visits him every day just like Mac does with Bloo. Wilt & the other Friends whom know Indy's secret identity very often help kick Raptor butt, even Bloo (sometimes).

 

Eduardo: Eduardo is an imaginary protector friend with a Spanish accent and speaks "Spanglish" (combo of English & Spanish). He may seem scary looking, but he's actually a coward and one of the kindest, gentlest Friends around. But in spite of his almost constant state of terror, however, he is incredibly strong and can be trusted to come to his friends' rescue whenever they are truly in trouble.

 

Coco: A wacky friend whom is a combo of a bird, plant and airplane, she can only speak & write the word "coco" at various speeds and with different emphasis. Everyone else understands her without any apparent difficulty. Her favorite drink is cocoa which sometimes causes confusion. She can also lay colorful plastic eggs that will have virtually any item inside them; however, she won't always lay an egg carrying something that the others need.

 

Frances "Frankie" Foster: Madame Foster's 22-year-old granddaughter, she cleans & cooks around the House. She is pressured by Mr. Herriman into doing more chores than usual, but doesn't enjoy it, and thinks of herself as "punk rock." She is good-hearted, hard-working, caring & a great person in general. She's like a big sister to the residants.

 

Mr. Herriman: Mr. Herriman is a giant imaginary rabbit created by Madame Foster herself, when she was a child. He serves as the president of the home, and expects the inhabitants to follow his rules (no matter how ridicules many can be). He is very formal and well-mannered, which leaves his tolerance for Bloo lacking in most regards. He isn't aware of Sara's alter-ego nor does he know Mac & the gang fight crime & Raptors.

 

Madam Foster: The founder of the foster home. She is elderly, but she has a lot of spunk and loves to play tricks on others. Her imaginary friend is Mr. Herriman, whom she imagined when she was a child and never gave up. It sometimes appears that she finds out Indy's secret identity, but no one's sure.

 

Goo: Goo is an African-American girl, she's a friend of Mac who named herself Goo Goo Gaga when she was a baby because that was all she knew how to say. Her nickname (just to make things simpler) is Goo. Goo has an over-active imagination and has imagined over 600 friends! At first she was a nuisance to Foster's because she over-populated the place but now her mission is to find homes for all the hundreds she imagined. The fast-talking, kinda wacky Goo only imagines new friends in dire emergencies.

 

Cheese: A pale yellow Imaginary Friend, at first Mac thought he created him when he woke up one morning to find Cheese in his bed. But it turns out, Mac's neighbor, Louise is his creator and Cheese likes to wander off. He likes chocolate milk & cereal even though, Mac said at one time he was lactose intolerant. He is annoying & dim-witted and calls many by the wrong species, he is seen as a nuisance umong Foster's and the Ex-Dino HQ.