Marcus is a friend of the Nikki Maxwell and Theodore L. Swagmire III. He is also the crush/boyfriend of Chloe. He is a recurring character in the series and, is a member of the band Actually, I'm Not Really Sure Yet. He appears in Dork Diaries: Tales From a Not-So-Talented Pop Star and Dork Diaries: Tales From A Not-So-Happy Heartbreaker
He is shown to be a sweet, thoughtful, shy character through out Dork Diaries. He is also a very talented guitarist. His sweet, kind personality makes him popular with the female students. But he is labeled a dork by most male companions because of his shyness.
Marcus has straight brown hair which is in a ponytail for Tales From a Not-So-Talented Pop Star but cut in a moptop for Tales From a Not-So-Happy Heartbreaker.His eye color was never mentioned in a book but could possibly be brown blue black grey hazel green violet.
- He is the guitarist for Actually I'm not really sure yet
- He went to the sweetheart dance with Chloe
- He is close friends with Theo.
- he made three appearances in the books.
- It is hinted in Nikki's blogs that Mackenzie tried to flirt with him, to make Brandon jealous.