Joseph His Friend From School, or simply Joseph, is a main character in the SML videos. He is a young Koopa Troopa who is Bowser Junior's best friend. Joseph is shown to be very athletic, being able to do flips into the pool, streaking hoops in basketball, and is also skilled in other sports. Joseph is shown to be arrogant and has a lot of pride. When Junior passes summer school and he failed, he said that Junior cheated and denied that he failed. Due to living a creepy rundown house with two dead parents, Joseph has some serious problems. Usually Joseph and Junior gang up on Cody and call him gay. Whenever Cody talks about Ken being real, he usually says 'Dude! He's a doll!'.
Joseph usually attempts to act like a teenager or a young adult but fails due to his stupidity. He enjoys insulting Cody's sexuality and smarts, and only hangs out with him because of Junior and to make fun of him. Despite considering Junior his best friend, Joseph is shown to be disloyal to him at times, due to others being cooler or having cooler possessions than Junior. Joseph is shown to be insane, due to him living with his dead mother, his suffering undead father, and Screwball in a house without electricity or running water, and only managing to feed himself by stealing from his dead mother's purse.
"He's just a DOLL, Cody!"
"The Wii U is lame, and... it sucks."
"What the hell is wrong with that kid? Ugh, Cody!"
"I'm tired of playing trains Junior, we play it all the time!"
Joseph's plush is the same one used for Koopa Troopa, which is why Koopa doesn't appear any more.
Joseph may have very well gone insane by the time of Joseph's House!, as his current living conditions are so poor that he might have snapped as a result, considering how indifferent he is about his home's current condition.
Due to the above fact, there is a conspiracy that Joseph will not be in the series for a year due to him being killed in Cody the Magician!. After Cody left, a screen popped up saying One Year Later, meaning that a Goomba could be replacing him for a year This was later proven wrong after the upload of Bowser Junior goes to the Sun.