This question was not easy to answer because the quality and evaluation of the male lead in the anime depended on many factors such as the plot, character creation, audience preferences, and so on. Moreover, the definition of "the most scum" varied from person to person.
However, if it was referring to the performance of the male lead in a certain anime, then it could be said that every character had its own unique charm and value. It was difficult to simply rate a character as the "worst".
One of the games often considered to have a bad story is 'No Man's Sky' at launch. The initial story was rather thin and unengaging. There were promises of a deep, meaningful exploration - but the story elements didn't really come together well, leaving players feeling a bit let down.
In my opinion, games that are super grind - heavy can be among the worst for fanfic. The focus on repetitive tasks in these games doesn't offer much in the way of interesting plot or character elements for a fanfic. For instance, some mobile games where you just keep doing the same thing over and over to level up. Games that are too niche and have a very small fanbase can also be difficult. There might not be enough interest or existing knowledge among readers for a fanfic based on such a game. And finally, games with a lot of licensed content that are difficult to work with legally are not great for fanfic writing.
In my opinion, 'High School DxD' had some issues as an anime adaptation of a light novel. While it was popular for its fanservice, it deviated quite a bit from the original light novel in terms of story and character growth in the later seasons. The story started to feel more like an excuse to show off the female characters' bodies rather than focusing on the plot and character development that was in the light novel.
In my opinion, 'Sonic the Hedgehog (2006)' has a really bad story. The plot is overly complicated and full of holes. There are time-travel elements that just end up confusing the players more than adding depth to the story.
Well, it could be a fanfiction that just has really unlikable characters. In the Hunger Games, we expect characters to have some depth and motivation. But in a bad fanfiction, they might be just one - dimensional. Say, a character is only mean for the sake of being mean without any backstory or reason. Also, if the fanfiction is just a copy - paste of other stories with a Hunger Games skin slapped on it. Like using the same old plot devices from other popular franchises but just changing the names to fit the Hunger Games. That would be a sign of a really bad fanfiction.
I think Sonic 06 has a terrible story. The story tries to do too much with time travel and multiple dimensions, but it just ends up being a jumbled mess. Characters are introduced without proper backstories, and the relationships between them are not well - developed. For example, the relationship between Sonic and Elise is really strange and doesn't seem to fit the Sonic universe at all.
Poor pacing is a major reason. For example, if an anime tries to cover too much of the light novel in a short time, it will end up skipping important details. Like in the case of some adaptations where the story feels disjointed as it jumps from one plot point to another without proper transition. This makes it hard for the viewers to follow the story and enjoy it as much as they could have if it was a better adaptation.
I recommend "Unlimited Firepower Evolution". This book is a light novel, a fantasy novel. The setting of the story was virtual reality. The protagonist was faced with various choices, deciding whether to live or die, oppression or resistance. This novel was relatively new and might not be very famous, but he could give it a try. I hope you like this fairy's recommendation. Muah ~😗
Games that lack a clear narrative structure are bad for fanfic. If there's no beginning, middle, and end in the game's story, it's really hard to create a proper fanfic. For example, some sandbox games where you just build things randomly without any overarching story. Another type is games with poor graphics that are so bad they can't inspire the visual imagination needed for a good fanfic. Also, games that are discontinued and have no further development can be a problem as the fanfic might not have a long - term base to build on.