Since 'lemon' usually refers to something not suitable, we should focus on proper Riddick fanfiction. In general, good Riddick fanfiction often features his survival skills. He is a tough character, so the stories might show him in dangerous situations and how he overcomes them.
I'm not sure about specific 'riddick lemon fanfiction' as 'lemon' often implies inappropriate content in fanfiction. But you can try searching on general fanfiction platforms like Archive of Our Own and filter for Riddick - related works that are appropriate.
There are fanfictions that focus on Riddick's relationships. Some might explore a romantic relationship between him and a new female character, perhaps a strong warrior from a different planet. This relationship could add a new layer of complexity to his character as he has to balance his solitary nature with his feelings for someone else. Also, there could be stories about his friendship with Johns, showing how their relationship might have developed differently if certain events in the movies had changed.
Survival is a common theme. Since the Riddick universe is so dangerous, the original characters often have to fight to stay alive. For example, they might be stranded on a hostile planet like Riddick himself.
Survival is a common theme. Since Riddick is often in harsh environments in his own story, when crossed over into other universes, he still has to fight to stay alive. For example, if crossed with 'The Hunger Games' universe, he'd have to use his skills to outwit the other tributes and survive the deadly games.
One interesting Hermione and Riddick fanfiction could be 'The Unlikely Alliance'. It explores what would happen if Hermione from the Harry Potter world and Riddick from the Pitch Black universe were to meet. They initially clash due to their very different personalities and backgrounds. Hermione's intelligence and magical abilities contrast with Riddick's brute strength and survival skills. But as the story progresses, they find common ground in their fight against a common enemy that threatens both of their worlds.
First, re - watch the Riddick movies to really get a feel for the character, his mannerisms, and the world he inhabits. Then, come up with an interesting concept. It could be something like 'What if Riddick landed on a planet that was completely made of ice?' or 'What would happen if Riddick had to protect a group of children?' After that, start writing out a basic plot outline, including the beginning, middle, and end. Don't worry too much about making it perfect at first.
The unique element is the blend of magic and science - fiction. In normal Harry Potter stories, it's all about magic, but when combined with Riddick, you get a mix of high - tech elements from Riddick's world like advanced weapons and spaceships along with the spells and potions of Harry Potter. It makes for a really different kind of story.
There could be. Slash fanfiction in this case would likely combine the magical world of Harry Potter with the gritty, science - fiction setting of Riddick. But it's important to note that such fanfiction may not be endorsed by the official creators of either franchise. Some fanfiction might focus on how characters from the two universes interact in unique situations, perhaps creating new adventures or relationships that deviate from the original stories.