Sukuna does die in the manga. The way it happens is quite dramatic and ties in with many other elements of the story, adding depth and tension to the overall narrative.
There may be claims out there about Brendon Urie and fanfiction abuse, but it's important to consider the source. In the world of fandom, misinformation can spread easily. Maybe there was a situation where something was misinterpreted. For example, if he made a comment about fanfiction in a way that some fans took the wrong way, it could have led to these accusations. But again, without more information, it's just speculation.
No. Ryomen Sukuna is a fictional character from Japanese mythology and modern manga/anime. He doesn't have a basis in a true historical event or person.
Nope. Ryomen Sukuna has no basis in reality. It's a product of the creative minds of the writers and illustrators who designed a captivating fictional character for the enjoyment of the audience.
I'm not entirely sure about the specific Gibson Bakery racist allegations original story. It could involve incidents where the bakery was accused of discriminatory behavior towards certain races, perhaps in terms of service, employment, or customer treatment. But without more detailed information, it's hard to be more precise.