Shawn Lathrop goes by Gus, and Lathrop.
Psych The Big Adventures of Little Shawn and Gus - 2008 Far Out was released on: USA: 8 February 2008
Gus
Pineapple is Shawn and gus' favorite fruit
Psych - 2006 Shawn and Gus of the Dead 2-16 is rated/received certificates of: USA:TV-PG
No, Burton Guster "Gus" (or all the other random names Shawn calls Gus) is played by Dule Hill.
He plays Gus in Dan in Real Life, with Steve Carrell.
Psych The Big Adventures of Little Shawn and Gus - 2008 Teacher's Lounge was released on: USA: 2008
Psych The Big Adventures of Little Shawn and Gus - 2008 There Will Be Chocolate Sauce was released on: USA: 2008
A Psychic Detective Agency
Season 2 Episode 1 'American Duos'.
Not quite - his real name is Octavius.