Also, of course Broly would fit the bill. It isn't helped even though his surviving a powerful attack was explained.
Vegetto himself deserves a mention. He was already the most powerful canon character in Dragon Ball Z, to a frankly stupid degree (Yeah, there's kind of a reason WHY Akira Toriyama undid that fusion in canon). Like his daughter he also receives a ridiculous amount of focus, and many characters seem to constantly harp on just how fucking awesome Vegetto is and how they're all just SO inferior to him. The fact that the creators have given Vegetto an entire fanfic all about him and his universe certainly help make him into a Creator's Pet.
While U16 Bra is still a Creator's Pet, Vegetto's massive over hype may have just been there to let XXI give him the Worf Effect
Zii from Ménage à 3. There a couple of reasons, but the big one was convincing DiDi not to pop Gary's cherry, an overarching theme of the comic. Her argument was that Gary would keep coming back to her begging for sex, though she didn't have any actual basis for that claim, and it was none of her business. Plus, like almost every interaction she has with DiDi, it comes off as another one of Zii's attempts to sleep with her. She was never criticized for any of this, and the narrative never acted like she was wrong.
Worse than that, Zii only very rarely receives any punishment for anything she does, no matter how dickish or possessive. The comic often tries to present her as a wacky, Lovable Sex Maniac without acknowledging that her "hilarious" exploits often go too far, and border on illegal. That said, there are fans who like Zii, and discussions about her get very intense, making her a Base Breaker. Still, the affection the comic has for her and refusal to punish her makes her a Creator's Pet to fans who don't like her.
There was an arc where Gary was invited into a threesome with another man and asked if the man could be replaced with Zii, who had slept with the woman. Zii berated Gary about this and stated that she would never try to force someone into a sexual situation for her own satisfaction, even though that pretty much sums up her character in a nutshell.
Makoto Yosue of Red String morphed into this over time. The author originally admitted she put him in to act as an obstacle and antagonist to the original Official Couple, but later interviews included statements such as him being her favorite character and getting very defensive on some occasions when he received criticism. He started getting a ridiculous amount of Character Focus for a supporting cast member (which on the official web site, he still listed under this category) and time spent on his supposedly horrible life (consisting of simply being sad a girl dumped him once) while other plots more important to the overall flow were getting ignored.
Xanthe Justice from Sinfest (aka "Trike Girl"). She hit this trope by being the in-universe catalyst for a Base BreakerRe Tool, plus an unhealthy dose of Writer on Board. For nearly a year, she was riding around talking about the "Sisterhood" taking down the "Patriarchy," trying to recruit female characters and talking down male characters. She remains in Mary Sue territory most of the time. For example, she gave a rather physical Get a Hold of Yourself, Man! to the hand of God.
"If you come into Unsounded thinking I want you to forgive Sette her foibles because she's so cute and because I've stuck her in the lead, you got the wrong idea. But it's my fault if they get the wrong idea 'cause I'm the one givin' out ideas! Some people just can't enjoy a heroine with the issues that Sette has. And I absolutely get that. Funnily enough people have short memories and when Murk was introduced it's like they thought here's another morally reprehensible character that Glass fatuously expects us to adore. But no, dorks, he's just a morally reprehensible character."