Adam

Adam is the guy Tess goes out with in "Misguided Motives with Boys." He was checking Tess out in The Blend, and then Allie and Tess thought that he's checking out Allie, but he wasn't. He came to their table and Tess started yelling at him, but it turned out that he just wanted to ask Tess out. She accepts. When he comes to pick her up, she realizes that he has an annoying laugh. She wants to go with him to the dance, but only because he is hot. She ends up dumping him, but Kaylee texts everyone that he dumped her.

Nerdy Nicky

Nicholas "Nerdy Nicky" Demopoulos is a student at Tess's school. Nerdy Nicky appears in Social Death with Boys and Monkey Talk with Boys. He is considered a nerd by most of his classmates but seems to be friends with all of the matheletes, especially Gordon. Nicky is portrayed by Daniel Winston.In Nerdy Nicky's first appearance, Monkey Talk with Boys, he gets invited to the party of the year, although he is only invited to be made fun of in the party.

In his second appearance, it is shown that he used to be a "cool kid", but that changed after he joined the mathletes in eight grade. He records all the matlete practices and appears to be interested in audio visual as seen in Social Death with Boys.

Jack Foster

Jack Foster is the father of Gabe Foster, Tess Foster, Sam Foster andSpencer Foster in the show Life with Boys. He is portrayed by Sandy Jobin-Bevans.

He is known to be a very caring and a loving father, but when his kids get in fights, he tries to tend out of it. He is known for his long and inspiring speeches, causing his kids who did something bad (mostly Tess) to confess. 

• He has a twin brother named Jerry.
• He had a rabbit pet named Professor Cuddlebuns.
• When he was a baby, he got into a lot of fights with his brother.
• He also hates it when Tess uses his words against him.
• The subject of his wife has never been a main focus in the series.
• He didn't want Tess's ears to get pierced.
• He has a love-hate relationship with Helen Foster.

Spencer Foster

Spencer Foster (born 2004) is the youngest of the Foster family. He is an eight year old, precocious scary-smart, and uses these tools to his advantage. His older brother Gabe is his "idol", and he always seeks out his advice. He is portrayed by Jake Goodman. He constantly copies what Gabe is doing and usually makes him do the right thing by telling him he looks up to him. Spencer isn't as well-developed as the other brothers, but he seems to just go along with what the other brothers are talking about. 

Kaylee

Kaylee is the anatagonist in the Nickelodeon series Life with Boys. She is Tess's arch enemy.Kaylee is arrogant, mean, and fierce. She hates Tess because Kaylee is the most popular girl in school and popular girls only make friends with the "populars". She is very ditzy and self centered. Tess and Allie have implied that she is stupid and notes that she doesn't even know who Albert Einstein is.

Kaylee is also the head Cheerleader at their school. She is also on the same cheerleader team as Allie. There are hints that she might not like Allie because she is friends with Tess and she also hates Sam Foster. She often bullies Tess and calls her names, usually "Boy - Girl Freak", because Tess is a female wrestler.Kaylee has long blonde hair with highlights. She is tall and slender, and taller than both Tess and Allie. She wears braces because she has an over bite. She's interested in fashion.

Sam Foster

Samuel "Sam" Foster is definitely not a "cool" kid. He is Tess' twin brother (and is one and a half minutes older than her) who less successful with the girls than his older brother Gabe. Sam has a massive crush on Allie, but his efforts to win her heart always end in rejection. His unconditional love for Allie is seen to be extremely sweet in the episode The Big Kiss-Off With Boys. He is a freshman at Westfield High School.

Sam tried to attract girls using many methods, such as asking a girl named Emma to be his math tutor, pretending that he is terrible at math. He is also somewhat desperate to fit in with popular male classmates, in the episode, Smoking With Boys, he took up smoking in order to fit in. Unfortunately, this effort has failed as well.

Gabe Foster

Gabriel "Gabe" Foster (born 1995, age 18) is the oldest of the Foster siblings and knows how to get his way. Gabe is one of the stereotypical boy hearttrobs of high school who is kind of a player when it comes to girls, since he usually dates more than one girl at a time. He is very charming and knows all the things he needs to know to get through high school although these techniques seem to only work for him and to his sister, Tess. He is a sophomore at Westfield High School.

Gabe is sixteen years old and has blonde hair which he gets from his mom and is looked up to by his little brother and the youngest of the family, Spencer. Gabe can be hardheaded and easily annoyed by people but he can sometimes be tricked by people and not even realize it.

Gabe can be uncaring such as when he was dating two girls and couldn't remember either of their names but he always tries to be supportive unless whatever it is annoys him but can also be the reversed like when he switched clothes with his younger brother Sam to help him get over with his major crush on his sister's best friend, Allie In Set Up's With Boys.

Gabe is also a trouble maker getting detention multiple times and always replying to his dad " I didn't do anything" in a rather whinny tone and also says "Don't you trust me" is a rather saddened tone but is always mimiced by his dad at his failed attempts.

Gabe always tends to be using electronics such as watching tv or texting on his cellphone.