Mr. Pig is an early character from the SuperMarioLogan series. He's one of Mario's best friends.
Mr. Pig is a pig who originated from Toy Story. He was with Black Yoshi. He had a high-pitched voice and likes Call Of Duty And Koolaid, Just Like Black Yoshi. It can be assumed he was raised in the "hood" like Black Yoshi, as he revealed in Black Yoshi's debut that he can talk in a ghetto voice.
He used to be a main character, before being overshadowed by Tony and Mama Luigi. Mr. Pig is now used occasionally but still lives with Mario just like Tony The Tiger.
He reappears in Black Yoshi & The Birds Episode 7 Season Finale as the true main antagonist (similar to Miles Axlerod from Cars 2). He wants Black Yoshi to kill the birds but Mario sees him in the kitchen holding Black Yoshi hostage. He gets killed from Teliban blowing up the bed with Black Yoshi.
He made a reappearance in The Big Thanksgiving. Here, Mario and Bowser are in the front of the table, and Mr. Pig is near the back, referencing the fact that Mr. Pig is no longer a main character, and the newer characters such as Bowser, Bowser Junior, Cody, Joseph, and some of the other main characters have taken the mantle.