One of the pseudonyms of author Charles Grant. Lionel Fenn Writes moderatly good humorous fantasy novels.

Kent Montana books
A actor and baron who fight monsters--monsters that you might have seen in the movies, in fact.
Kent Montana and the Really Ugly Thing from Mars
Kent Montana and the Reasonable Invisible Man
Kent Montana and the Once and Future Thing
The Mark of the Moderately Vicious Vampire*

Diego series
Wild West gunslinger loose in 1990s NY city.
Once Upon a Time in the East
By the Time I Get to Nashville
Time: The Semi-Final Frontier

Gideon Sunday books
A retired football player and his baseball bat, transported to a fantasy world.
Blood River Down*
Web of Defeat
Agnes Day
668: The Neighbor of the Beast

The Seven Spears of the W’dch’ck

From what I've read, Lionel Fenn isn't comming up with any new and inventive ideas, but is doing okay reusing the old ones. The books are easy to read and reasonable funny. The plots are nothing special, the worlds aren't well planed out, and sometimes his humor doesn't come off right. But still, better that some writers out there.

* These (2) books I have read, and have made WUs for.