Jambette is very much a Normal. I've had her since Day #01 in my first town, Applewin. She's a very mature frog, who inhabits the Normal characteristics of being polite, considerate, loyal, and encouraging.
I do think there are some villagers who come across like they could have doubled. Meaning, in addition to their assigned personality category, there is at least one more category that could have suited them. As an example of this, I think a good amount of the Jocks could have been Lazies. I think some of the Uchis could have been Normals. (Though I admit that last one is a stretch. But, I'm thinking of Muffy.)
This is a very creative game. Pulling off a believable array of 333 villagers is difficult. I had a thread, posted months ago, that had some really good responses. It asked people which villagers really look like the fit their category.
By the way: To answer your question, citing at least one specific example, I will suggest
Cookie. (She looks more to me like she could have been a Normal. But, the game probably thought it had enough female dogs who are Normals.)