I don't know much about his irl personality. I just know about the personna he has created in his books and monologues.
For me it's both, partly because he's so close-up here and people tend to form opinions of their local celebrities, and partly because my state is plenty steeped in that quaint Minnesota culture. So things that take it in new directions are more interesting to me.
Fargo, for example, captures the culture (despite the mostly ridiculous accents) but gives it a novel twist.
However, I did have a next-door neighbor for a while who was being considered to replace Keillor when he retired (before the scandal) and would have been good. He's a storyteller who performs onstage all over the country and in Europe, presents one-man shows at the Guthrie Theater, has told a lot of stories on NPR, has published books and put out CDs. Anyway, his material is very recognizably Minnesotan too -- he even uses somewhat of a
Fargo accent -- and the suburb he grew up in is only closer to Minneapolis than the suburb Garrison Keillor grew up in. Kevin's take is more original, to me.