Adventure is a very common theme. Since Toothless is a dragon, he often goes on exciting journeys in different crossover worlds. Another common theme is friendship. For example, when he crosses over to a world like the Avengers, he forms new friendships. Also, discovery is common. He discovers new things about different worlds and cultures in the crossovers.
A powerful demon lord from the DMC world would be a great antagonist. This demon lord could see Toothless as a threat or a tool to use for his evil plans. He might try to corrupt Toothless or use his power to gain an edge over the DMC heroes.
Sure. 'Toothless in Wonderland' is an interesting one. It's a crossover where Toothless finds himself in the strange world of Alice in Wonderland. The contrast between Toothless's dragon nature and the wacky Wonderland characters is really fun to read. Then there's 'Toothless and the Jedi'. This combines the world of Star Wars with Toothless. He interacts with the Jedi and Sith, and his dragon abilities add a whole new dimension to the Star Wars universe. Also, 'Toothless and the Pirates' is a great read. Toothless on a pirate ship, dealing with pirates and searching for treasure is quite the adventure.
One idea could be that Toothless somehow gets transported to the DMC universe. Maybe he forms an unlikely bond with Dante. Since Toothless is a powerful and intelligent dragon, he could assist Dante in fighting demons, using his speed and fire - breathing abilities in unique ways.
Toothless' ability to fly would give the DMC characters a new dimension of mobility. Dante could use Toothless to quickly reach high - flying enemies or access hard - to - reach areas. Toothless' plasma blasts could be combined with Dante's firearms. For example, Dante could time his gunshots to coincide with Toothless' blasts for a more powerful attack.
A plot could revolve around a new enemy that threatens both the world of How to Train Your Dragon (where Toothless is from) and the Devil May Cry universe. The characters from both universes have to team up. For example, Vergil might be initially skeptical of Toothless but then come to respect his power. Toothless could also interact with the different weapons and magic in the DMC world in an interesting way.
There may be some extremely creative and boundary - pushing fanfiction out there with this premise, but it's not something that is typically found in the more well - known or widely - accepted "How to Train Your Dragon" fanfiction. Usually, fanfictions in this fandom focus on things like their adventures, friendship, and the development of their bond in a more traditional sense. So, while it's possible, it's not a common plot line.
Another common theme is adventure. Fans like to take Toothless on new quests and adventures, often in uncharted territories. For example, some fanfictions might have Toothless exploring a hidden dragon realm. It makes for exciting reading as we get to see Toothless use his skills in new and different situations.
Toothless and the female Nightfurry could potentially have an interesting relationship in a fanfiction. It might involve elements of friendship, adventure, and mutual respect. For example, they could embark on a journey together to save their world from a common threat. Their different abilities would complement each other, making for an exciting story.
Hiccup could be a main character. Since he is Toothless's close friend, he could help Toothless take care of the baby. He might use his human knowledge to build a safe place for the baby to live.