Henry
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For a good example of a Human Paladin/Rogue, check out James Wyatt's web site, wherein he last year detailed his play of just that sort of character - a human thief who was called Joan-of-Arc style, and is trying to reform!
Seriously, both concepts mentioned, Paladin/Rogue, and Halfling Barbarian, are quite workable! A paladin/rogue, as Takyris mentioned, are quite useful at being detective-types. (In Piratecat's campaign, Palladio of Roaringbrook would have been quite interesting as a Paladin/Rogue instead of a Fighter/Rogue.)
A halfling barbarian silly? Think of a pissed-off rabid wolverine, and tell me how silly the concept is again.
After all, a rottweiler is not that much bigger than a halfling, and they can kill a human.
I really can't think of any truly unworkable "silly" concepts in 3E - Except for a Beholder Bard.
Or a Tarrasque Rogue.
Seriously, both concepts mentioned, Paladin/Rogue, and Halfling Barbarian, are quite workable! A paladin/rogue, as Takyris mentioned, are quite useful at being detective-types. (In Piratecat's campaign, Palladio of Roaringbrook would have been quite interesting as a Paladin/Rogue instead of a Fighter/Rogue.)
A halfling barbarian silly? Think of a pissed-off rabid wolverine, and tell me how silly the concept is again.

I really can't think of any truly unworkable "silly" concepts in 3E - Except for a Beholder Bard.

Or a Tarrasque Rogue.