Megan Parker

Megan Jessica Parker is the main antagonist of the Nickelodeon live-action TV series Drake and Josh.

She is Drake and Josh's younger sister who is mean-spirited, rude, bratty, and troublesome who acts nice and sweet when around her parents and mean and cruel to her brothers when they aren't around and always gets away with her cruelty.

She is portrayed by Miranda Cosgrove who also portrayed Carly in iCarly.

Personality
Megan is primarily mischievous and sarcastic most times, but she also helps other people when they are in need, like helping Drake and Josh get out of the jail in "The Gary Grill". Still, she loves to prank and "torture" the lives of her brothers and think of it as a job. Megan also seems to not care if her brothers are happy or not when she pranks them. She is the youngest and mostly she can get away with anything and mostly she is usually gets away with anything and gets her brothers in trouble a lot of times.

Megan is also really good with machines and electronical stuff, as she has a secret spying panel in her bedroom and a briefcase full of spy devices. It is never explained where or how she obtains her gadgets.

Trivia

 * Megan is similar to "Sam Puckett" from "iCarly" and Mindy Crenshaw.
 * Miranda Cosgrove and Jerry Trainor don't interact in Drake and Josh or have any scenes together before "iCarly".
 * Megan is wildly the most hated character in the entire series by fans for her needlessly mean-spirited treatment towards Drake and Josh, but NEVER gets any comeuppance for it. There are several episodes (particularly in seasons 3 and 4; while 1-2 just had her do her more harmless pranks) in which Megan comes out of nowhere, just to give Drake and/or Josh unsatisfactory misery and give them no happy endings. "Peruvian Puff Pepper" (ironically unintentional, as pointed out by herself), "Sheep Thrills" (the ending), and "Tree House" are the most criticised episodes in the entire series that involve her torturing them and giving them unhappy endings.
 * She is the polar opposite to Carly Shay.
 * She should be around Carly Shay's age since she was thirteen when the show ended and that's how old Carly was when iCarly first began.