A forgotten ancient entity that was sealed away long ago in both worlds. It has now broken free due to some recent events in both HTTYD and Spyro's universes. This entity is made of pure dark energy and can possess both dragons and other creatures. It wants to plunge both worlds into eternal darkness and rule over the chaos it creates.
A powerful dragon - mage hybrid could be the main antagonist. This creature could have the ability to control both the dark magic from Spyro's world and the power of the more menacing dragons in HTTYD. It wants to rule both worlds and is using its magic to create chaos and turn the dragons against each other.
An evil viking sorcerer who has learned about Spyro's world and wants to harness the power of the gems there. He teams up with some of the more hostile dragons in HTTYD like the Red Death (if it somehow survived) and plans to use their combined strength to take over both Berk and Spyro's realm. He uses dark magic to corrupt the minds of the dragons and the vikings.
Perhaps the vikings of Berk accidentally open a portal to Spyro's realm while exploring a new area. Spyro is intrigued by the vikings and their relationship with dragons. Meanwhile, Hiccup tries to understand Spyro's abilities and how they can be used to improve Berk's defenses. They could team up to rescue some baby dragons that were captured by an evil force from both their worlds.
It could be an evil dragon that preys on Spyro's troubled state. This dragon might try to manipulate Spyro into doing bad things or lead him further astray from finding peace with his troubled soul.
Kaos could be a great main antagonist. He might see Dark Spyro's power as a tool to finally achieve his evil goals and try to manipulate him.
It could be an ancient evil force that wants to use the Dark Master Son's power for its own dark purposes. This force might see Spyro as an obstacle in its plan to dominate the world.
Maybe the main antagonist is a sorcerer from a far - off land in Spyro's world. This sorcerer is jealous of the attention the human is getting and the potential power they might bring. So, they start causing chaos and trying to turn the other creatures in Spyro's world against the human and Spyro. They could use illusions and dark spells to make things difficult for our heroes.
The main antagonist might be a dark sorcerer. This sorcerer has put a spell on Spyro's mother long ago, trapping her. He doesn't want Spyro to find her because he fears that together they will be strong enough to break his power. He uses his minions to try and stop Spyro during his journey to find his mother.
Once upon a time in the land of Berk, Hiccup was flying on Toothless when a strange magic portal opened. Out of it came Merida from the land of DunBroch. Hiccup was startled but curious. Merida was amazed by the dragons. They decided to team up. Hiccup showed Merida how to ride Toothless and in return, Merida taught Hiccup some of her archery skills. Together they went on an adventure to save both their lands from a common enemy that was using dark magic.
Once upon a time in the magical world where Crash and Spyro both exist. Crash was running around in his jungle when he accidentally tumbled through a strange portal. He found himself in Spyro's dragon realm. Spyro, being the friendly dragon he is, greeted Crash. Together, they decided to explore a new, mysterious land filled with both the challenges Crash was used to, like crazy masks, and the treasures Spyro loved to seek. They overcame many obstacles, and their friendship grew stronger with each adventure.
It could be an old enemy of Spyro who has been plotting his downfall for a long time. This antagonist might be another dragon who is jealous of Spyro's popularity and power at the academy. He could manipulate the situation to make Spyro turn evil and then use him as a weapon against the Skylanders.
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