Technically, I only have one true fursona, that being my dragon character Draconius Tarsai Draken, aka Captain Spyro. However, I have a large fic-verse that I created through years of RP and influence, and as a result, I have a larger roster of characters to go with the Captain.
Darwin Arcticus
Flia Galeron
Blue Fox of Faith
Tileena Alkai
Chesna Tre'shira
Kilas Dante
And many others.
Neither one of these characters are a fursona or sub-fursona, but I use them depending on the plotline my fellow RPer from Pennsylvania and I decide to go with. Half the time, it's random shit or we actually follow serious ideas.
I've contemplated creating a sub-fursona though, but more than likely, it'll be separate from my DragonStar fic-verse.