One common theme is friendship. Writers often explore how a human and Spyro can form a strong bond despite their differences. Another theme is adventure, where they team up to face various challenges in Spyro's world or the human world.
Common themes include discovery. A human might discover Spyro's magical world and all the wonders and dangers within it. Also, there's the theme of protection. Maybe the human has to protect Spyro from some threat in the human world, or Spyro has to protect the human in his own world. And of course, there are often elements of magic and mystery, as Spyro's world is full of these things and the human character is usually new to it all.
There are several common themes in Spyro and human fanfiction. First, the theme of adaptation. The human character has to adapt to Spyro's world which is very different from their own, with different rules, creatures and landscapes. Second, the theme of cooperation. They need to work together to achieve a common goal, whether it's defeating an evil force or finding a lost treasure. Third, the theme of self - discovery. Through their interactions with each other, both the human and Spyro may learn more about themselves. For instance, the human might discover a courage they never knew they had, and Spyro might learn more about the value of having a non - dragon friend.