She's very whiny, annoying, and obnoxious, especially towards her husband.
It's obvious that the sole purpose of her existence was to pander the "Karen" slang, and the way she's portrayed can be offensive to anyone named Karen who is actually nice.
She is very stupid to the point where it makes Black Yoshi look like a misunderstood genius, despite that not being true either.
Karen is a poorly developed character who doesn't have that much of a personality, other than being annoying.
She constantly calls her husband "Boiny", which can get very annoying. It's also never even explained why she calls him that. In one video, when she actually does say his name for the first time, it leaves him shocked believing she never knew it.
The main problem: She constantly cheats on Brooklyn T. Guy with another man when he tries to leave her; she takes most of his stuff to force him to stay with her.
Her loud voice is very obnoxious as she basically shouts her dialogue whenever she talks.
She does a poor job at taking Brooklyn Guy's place such as how she failed to properly burn out a fire.
She is also very immature like in "Home Alone 2" where she wouldn't stop childishly complaining about her mask.
Her name changing was always confusing when she first goes by the name "Sharon", and now her name changed to "Karen" for unknown reasons.
She's one of the main reasons why Brooklyn Guy was derailed into a nutjob in mid-2022 because of how she abuses him.
She did help her husband with his job in "Brooklyn Guy's Day Off".
She still loves her husband despite being overly obnoxious in expressing said 'love.
She is one of the only genuinely nice characters on the entire channel.
She is supposed to be unlikeable so that the audience will sympathize with Brooklyn Guy.
Despite being annoying, Elaina Keyes does admittedly do a good job voicing Karen, and she has a big New York accent.
She made a good point about the consequences of spending all of the life savings on the heat tickets for a basketball tournament in "Brooklyn Guy's Bad Decision".
She has redeemed herself a bit in recent videos, as she is shown to be smarter than Brooklyn Guy.
She only died in three episodes:
"Home Alone 2"
"Attack of the Killer Shrimp!"
Her name was originally Sharon as mentioned in "Jeffy Has Hiccups!" by her husband and in her appearance in "Black Yoshi's Mistake!". However, her name is confirmed to be Karen from "The Life of Brooklyn Guy!" onwards. Back when her first name was not confirmed, Brooklyn Guy referred to her as Karen in "Jeffy Gets Chicken Pox!".
She always calls her husband "Boiny".
It's been speculated that Brooklyn Guy's real name is "Bernie" since she pronounces it "Boiny" due to having an exaggerated Brooklyn accent. However, Brooklyn Guy confirmed that his full name is indeed Brooklyn T. Guy.
However, in "Brooklyn Guy's Depression!", Karen reveals that she likes calling Brooklyn Guy "Boiny" because it's "a thing".