Jeffy

Jeffy Jeffy (or just Jeffy) is a ridiculously stupid kid who keeps putting stuff in his nose.

Personality
Jeffy is one of the most controversial characters in the series and has a bad habit of smacking his diaper, which unusually happens to be outside his pants. When he is called a "bad boy", he tends to throw a tantrum by throwing his head onto anything but  calms down when he is called good. His mother delivered him to Mario because she was too annoyed by him and didn't want to deal with him any further. Mario,  Chef Pee Pee, and  Cody  hate him, while  Junior  and  Joseph  think he's awesome after surviving a game of Russian Roulette once and  Rosalina  is more loving and caring towards him. Jeffy, however, has been shown to act rather smart at times, such as in "Jeffy's Homework!" when he reasoned that 8-4=8,, since they are taking 4 out of the equation, even going on a profanity-laced rant. Later, in "Jeffy's Bedtime!", he called the nameless tall character in Green Eggs and Ham a liar, since the character claimed he liked the green eggs and ham, but the illustration clearly shows he didn't eat the ham at all. He used to live at an unknown address before being dropped off at  Mario 's door. Jeffy also tends to soil himself sometimes. He also seems to like cheese on his green beans.

He has also shown a bratty side, as seen in "Jeffy's Bedtime!", where he demands that Mario and Rosalina make him green eggs and ham, and in "Jeffy Gets Potty Trained!", when he demands that Rosalina give him marshmallows instead of peas.

Mario
Mario is Jeffy's Guardian. Mario hates Jeffy while Jeffy likes Mario. Jeffy usually calls Mario "Daddy" even though Mario says he is not Jeffy's Dad. Mario is not happy that Jeffy was dropped off at his apartment door and he now has custody over Jeffy. Mario gets frustrated with Jeffy in nearly every video they appear in together. Most of the time however, it seems that Jeffy annoys Mario not on purpose. Mario has tried multiple times to get rid of Jeffy, but Jeffy ends up coming back after, or in the case of Where's Jeffy?, Mario goes back to get Jeffy because he had Rosalina's necklace. In  Bowser Junior's Nerf War!, Mario makes a small cameo appearance right at the end and attacks Jeffy with a Nerf Gun.

Chef Pee Pee
Jeffy seems to like Chef Pee Pee. Chef Pee Pee however does not seem to have patience for Jeffy, just like Mario. Chef Pee Pee was annoyed with Jeffy when Mario and him were trying to get Jeffy to eat his green beans.

Rosalina
Jeffy and Rosalina seem to get along well. Jeffy usually calls Rosalina "Mommy" just like how he calls Mario "Daddy." In Jeffy Gets Potty Trained! though, it was shown at multiple points that Rosalina is starting to lose her patience with Jeffy, becoming almost as frustrated with him as Mario as Jeffy refused to eat his peas.

Brooklyn Guy
In Mario The Babysitter!, the Brooklyn Guy (as a cop) doesn't seem to mind Jeffy. However in the third episode of  Who Wants To Be A Millionaire?, the Brooklyn Guy gets annoyed with Jeffy.

Bowser Junior
Bowser Junior thinks Jeffy is awesome for surviving Russian Roulette. Jeffy also seems to like Bowser Junior. However, Jeffy did get upset at Bowser Junior when he knocked over the Lets Go Fishin' Board. In Bowser Junior's Playtime 4, Jeffy takes part in one of the scenes with Bowser Junior.

Joseph
Like Junior, Joseph thinks Jeffy is awesome for surviving Russian Roulette.

Cody
Jeffy seems to like Cody, but Cody doesn't seem to like Jeffy. When Jeffy smacked his diaper in Bowser Junior's Game Night 3, Cody seemed to like that and did it to himself. Cody however did seem to get annoyed with Jeffy as the video progressed.

Jeffy's Mom
Jeffy and his mom appear to most likely have a bad relationship, as his mom didn't want him around due to being annoyed by his sheer stupidity, which was why she dropped him off at Mario's apartment.

Jeffy's Dad
Not much is known about Jeffy's relationship with his dad, while it can be assumed that he was annoyed by Jeffy's stupidity. He is mentioned in in Bowser Junior's Game Night 3.

Quotes

 * "My name is Jeffy. See? It says it on my shirt, Jeff-y."
 * "Wanna see my pencil?"
 * "AAAAAAAAAHHHHHHH!!!!!!!"
 * "Someone pooped my pants."
 * "See my pencil? It can go up my nose."
 * "(Cries) I'm a bad Jeffy?! (Bonks head on the nearest object)"
 * "I'm a bad boy?!"
 * "Why?"
 * "I want that for my nose! I got an extra hole!"
 * "It says I'm a good boy."
 * "Coloring book?"
 * "Hey. I'm a mummy."
 * "Where my pencil at? I lost my pencil!"
 * "Why did you take my crayon?"
 * "Hey, I found my pencil."
 * "Hey! I lost my crayon! Has anyone seen my crayon? It's yellow."
 * "Yeah, I want some gummies."
 * "Yeah, so it won't get dirty!"
 * "It's starting to itch."
 * "So I don't poop my pants!"
 * "It's smeared up my bath."
 * "I'm running out of toilet paper."
 * "Who's gonna wipe me?"
 * "(Cries) You said Jeffy's weird?! (Cries again)"
 * "(Cries) You said Jeffy being a bad boy?!"
 * "It feels good on my pee-pee."
 * "Feed me, I'm a Giraffe! Ah! (Pats his Mouth)"
 * "Gummies right here!"
 * "You said jeffy's a bad boy?" (Rams his head on the Border on the door)
 * "Well, my diaper's still clean."
 * "And my pants are dirty."
 * "Please wipe me."
 * "Daddy come wipe me."
 * "But I like the cheese on my green beans."
 * "If I wanna eat the money, I'm gonna eat the money."
 * "I don't like green beans!!!!"
 * "Want some more money?"
 * "Can I do brain surgery on you?"
 * "I'm just gonna use my pencil."
 * "He looks like my daddy."
 * "Ok, I get all the money!"
 * "My pencil broke off in my brain!"
 * "I knew that was the last bullet in there!"
 * "Yep, Seriously Need to shut up for now, Right?"
 * "(Cries) You lost my toy!"
 * "Bunnies don't lay eggs."
 * "Bawk Bawk."
 * "I don't get to see the Easter Bunny?"
 * "I love animals! My favorite animal is a carrot!"
 * "Where the f**k did you get that from? Because 4 is taken away so it's 8!"
 * "No, it's not! Where the f**k did it go? Where did it come back that fast?"
 * "No, it's not. The 4 looks nothing like a 2! What, did they adopted?
 * "I pulled it out of my ass."
 * "8."
 * "F**K THIS HELMET! F**K THIS PENCIL! AND F**K THIS DIAPER! I WANNA F**KING KNOW WHERE THAT FOUR WENT! TO COME BACK THAT F**KING FAST TO BE MAKING ANOTHER EIGHT! ITS EIGHT MINUS FOUR! YOU TAKE THE FOUR AWAY, IT'S F**KING EIGHT! I DON'T CARE WHAT YOU SAY, F**K EISENHOWER, AND F**K OTHER THOSE PEOPLE, I-ITS F**KING EIGHT! TAKE THE FOUR AWAY FROM IT! TAKE THE FOUR OUT OF THE F**KING CARD! PUT AN EIGHT DOWN HERE IN THE SPACE IT'S AN EIGHT!﻿"
 * "Fwog."
 * "Daddy taught me."
 * "Because you have an 8 up there, and you take away the 4, so it's not there anymore and the 8's left, you know it's 8."
 * "Ummm...74."
 * "Gidaraffe."
 * "Gi-da-ra-ffe"
 * "Fa-wo-guhh!"
 * "OK. Z Y X W V U T S R Q P O N M L K J I H G F E D C B, A."
 * "A B C D E F G....AAHH!"
 * "Because they don't love each other on that card, that one is a regular zero and another zero so it's 2."
 * "It's 2."
 * "Umm...baby 2."
 * "Because you have a mommy 2, and a daddy 2, and they had a baby, and it's a baby 2.
 * "Because you have one zero, and another zero."
 * "If numbers don't matter, why are we doing it?"
 * "Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, Strawberry, 50 fifty."
 * "I like mashed potatoes!"
 * "I wanna call my dad."
 * "I wanna be a doctor. I wanna do brain surgery."
 * "Kawk Kawww! Kawk Kawww!"
 * "You left me at the park with a chicken nugget and you said, Good luck, Jeffy!"
 * "Happy Meal?"
 * "Ok, you gotta catch me!"
 * "Helmet misses Jeffy?"
 * "The park?"
 * "I didn't give it to the squirrel. YOU gave it to the squirrel!"
 * "No, the squirrels are adopted me. Jeffy don't need a helmet."
 * "No, I'm not getting hurt. Jeffy good boy up here."
 * "This guy's a liar."
 * "But he hasn't even touched his ham yet."
 * "I want green eggs and ham!"
 * "Yes, there is, he told me he was gonna poop in my jammies!"
 * "But you asked for your keys."
 * "Oh, I'm sorry, sir. You've had too many! I'm cutting you off!"
 * "I don't want my peas, I want marshmallows!"
 * "I think I can poop, I think I can poop let me do it."
 * "I think I can, I think I can daddy."
 * "But there's something touching my ballsack!"
 * "I wanna eat my poop!"
 * "But it has a scary face on it."
 * "I'm a piggy!"
 * "Yes I am, look at my nose!"
 * "Daddy, I found Dory!"
 * "(gasps) Daddy?!?! Where are you going daddy? Why you're not coming up? Why did the bubbles stop?"
 * "I want a Pokémon battle!"
 * "Cookie Monster, I choose you!"
 * "Cookie Monster, use Thunderbolt!"
 * "Um...Sesame Street!"
 * "Yay! I win!"
 * "Did I win?!"
 * "I lost!? (Cries)"
 * "What will I do with this one?"
 * "I'm stuck in the camera!?"
 * "Hey, daddy I'm a piñata."
 * "Daddy, I can fly! I'm a bird!"
 * "You said "Shut up little shit!""
 * "What doing?"

Trivia

 * Many fans complained that Jeffy is offensive. However, Logan has stated that Jeffy is supposed to just be stupid like Chef Poo Poo, not mentally disabled. Others say that he only exists to make poor Mario miserable and make stupid jokes. This is a mistake that Brooklyn T. Guy has made in Jeffy's Stupid Home Video!.
 * According to some fans, he is similar to I.R. Baboon from I Am Weasel as both like to put stuff in their nose.
 * In the Pokémon series, Jeffy owns a Cookie Monster who can use Thunderbolt.
 * Despite being extremely stupid, Jeffy is still able to do many impressive acts, such as accurately painting the Mona Lisa on his Easter egg, finding a golden egg even though Mario threw it away, and say the full alphabet backwards.
 * Jeffy is first seen without his helmet in "Where's Jeffy?".
 * Jeffy sometimes speaks normally, and in 3rd person.
 * Jeffy is so far the only character to strike the same identical pose in the recent custom thumbnails.

Poll
Do you like Jeffy? Yes! No. Kind of.