The thing about a villager's catchphrase or clothing, is that you can "report" it to Isabelle and it goes back to normal. So I don't understand the extreme need for a villager's originality for clothing purposes at least. I understand the house/furniture thing a little, but I feel like I go into my villagers' houses so little that it doesn't really matter, or I don't really have a need to buy a whole lot of furniture from them.
Sometimes, villagers will also force their furniture on you or buy stuff of their own accord also, so unless you completely 100% ignore them it's really hard to keep the house original. I like sending my villagers letters and making the game feel special and homey to me, so any villager I sell or giveaway in the future (unless I really hated them) will probably not be original.
I enjoy getting a villager that's been loved on, anyway! I say to them, Show me the letters! Show me the furniture and clothing you got from friends! It's cool and makes them unique.