I don’t think Spyro will be quite as popular as Sonic or Mario considering the sheer number of his games that have sucked past the PS1-era, but a lot of millennials grew up with him, and he was so popular that the Spyro remake did very well.
The Spyro remake brought it to younger generations who can also grow up playing his games, and further cementing Spyro into overall nostalgia.