Similiarities
- They are both dragon heroes
- They both have similar personalities
- Their jobs or responsibilities are the same
- They were both been called, "dragon-boy" (Sheila the Faun calls Spyro "dragon-boy" while Rose/Huntsgirl calls Jake "dragon-boy")
- They both have a circle of friends and allies that are a mix of magical creatures and talking animals
- They both have best friends that act like idiots (Hunter and Arthur P. "Spud" Spudinski)
- The Dragon Elders and the Dragon Council both have the same jobs or responsibilities
- Spyro and Jake both have enemies that hated dragons and some of them are dragons that are evil
- During their adventures, they use magical items or spells to aid them
- They are both womanizers or "ladies men".
- They both have two best friends (Spyro's best buddies are Sparx and Hunter whilst Jake has Trixie Carter and Spud as his best chums)
- They both have former enemies that betrayed who they are working for (Bianca betrayed the Sorceress when she found out what her mistress is going to do with the baby dragons and Rose/Huntsgirl betrayed the Huntsclan when she realised Jake is the American Dragon)
- When it comes to the original Spyro series and American Dragon: Jake Long, dragons are usually the good guys and the main characters
- They are both skillful at some extreme sports, especially skateboarding
Differences
- Their ages are different
- Spyro is a purple dragon while Jake is a half-human, half-dragon
- They obviously live in different universes
- Jake can fly freely in his dragon form while Spyro needed to use a power-up in order to fly freely or be in speedways/flights or special levels
- Spyro can't breathe a continous stream of fire in his younger years but Jake can
- Spyro is capable of using his charge attack but Jake doesn't have this ability
- Their height and sizes are different
- Spyro doesn't have any parents and grandparents but Jake has
- Obviously, their voices aren't the same and different voice actors provided voices for them
- Spyro isn't the type of guy to be into romance and mushy stuff but Jake is quite the opposite
- Spyro can use a variety of breath abilities, however Jake can only breathe fire
- Spyro doesn't speak in hip-hop street slang but Jake does
Just let me know what similarities and differences I'm missing and I'll note them down.