I believe a good number of users on this platform have seen the user @BickerySebastian and perhaps some may have interacted with him a few times. Maybe you've seen his contributions to certain collabs, such as The Creature Collab, The Kart Kollab, Who's That Pokemeat, or perhaps The Cute Cat Collab. However I feel that it's important that everyone knows that he has done some very unacceptable things, unexcusable and never made up for, and that if you're running an art collab, do not allow this individual to contribute.

I will mostly be going from his more minor wrongdoings, to his more heinous actions. Let's begin.

To start, he used to be one of the main developers of Jonathan's Adventure in early to mid 2021. To make a long story short, he expressed behavior that made other members of the development team uncomfortable, and after some time, I decided to point this out. After he had a little fit, he was kicked off the team. However, this would drastically change the game due to him contributing many of the assets and art, and the game was cancelled because most of the team was not sure what to do with what was left. Against the team's will, he continued working on the game himself, dubbing it "Jonathan's Adventure: Bickery Edition" and as of I am writing this post, he is still trying to make the game. Ironically, his lackluster devlogs have not shown much important work at all, and usually consist of rambling about random things that do not show any interesting development, to the point that he briefly started calling his devlogs his weekly journal.

Sebastian also added a racist remark to Jonathan's Adventure.

Now, the behavior that made other members uncomfortable.

He often drew art of the characters who were at the time sonas of the team's members, mostly underaged, in sexual situations.

A very inappropriate faceset for Sasara, displaying her vagina, albeit censored.

A Game Over screen, depicting Jonathan being inflated, and Imasu as a giant penis with his eyes falling out.

The "Table" series, depicting Jonathan and Kabi having sex.

A drawing of the JA characters being surrounded by giant penises.

He would also make odd advances on other members, including someone that I was dating at the time, despite he himself having a girlfriend at the time aswell.

This behavior eventually led up to being pointed out, having him kicked off the team.

Sometime after he was kicked off the team, he began to develop a strange obsession with the character Kabi.

So after most of this I released "Jonathan's Adventure! 2" on April Fools Day 2022 to poke fun at him. 

This jab at him deeply angered him, and he began to express his beliefs about how sexualizing someone's sona is perfectly fine and that it does not relate to sexualizing the actual person, and also claims that it's fine because big companies' characters have rule 34 drawn of them every day.

In the same server he complained in, one friend he had in it is a groomer, the groomer in question was Sharkynatty. Sharkynatty, presumably 20 at this point in time, is e-dating a teenager, and often drew ship art of their sonas together, even sexualizing the teenager's sona in some drawings. Sebastian seemed to support this behavior because he never said anything about how it was obviously wrong. He's also drawn the two characters together on certain occasions. Another friend of the two, TheRandoSam, aka Grunkle Sans also supported this behavior.

But that's not even the worst thing he has done. 

Sebastian has also had a history of sexually abusing his ex-girlfriend.

This speaks for itself.

Sometime after they broke up, his ex had to shut down their internet prescence due to supporters of Sebastian harassing them and their friends.

Even after all of this, Sebastian continues his obsessive behavior with Jonathan's Adventure, the people involved in it, and supporting the pedophile along with his other friends that do the same.

(New addition, 6/21/2024) I've recently found out that Seb has made a fetish animation of Gemmkore's sona, having a Changed-like transformation into the cat from the boykisser meme.

Note that Gemm is 15, and Seb is 19.

The animation itself. (+ more evidence)

Sebastian acknowledges what Gemm said in the description of a drawing of Gemm's character put into a Pomni outfit, for some reason.