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.
Blue Fox of Faith
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.