Hard mode would be playing an entire party of tieflings. Now if that doesn't cause some angry mobs, I don't know what will.
I feel like hard mode would be playing a party of half-orcs; until the domain of Saarkaath was introduced in an online netbook, there were no orcs or half-orcs native to Ravenloft, and even that domain is an Island of Terror, likely visited by few. The peasantry of Barovia has probably seen (or think they've seen) the occasional tiefling, but they've never seen a half-orc that wasn't an outlander.
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Pauper