Noè is a giant teddy bear of a man whose Constantly Curious personality, tendency to marvel at any new things he sees, and general nice, pleasant personality make him very endearing to watch.
Similar to Noé, Jeanne has a childlike curiosity for the things of the world that are new to her. She also instantly melts at any gesture of kindness towards her.
Interestingly, we find that none other than Vanitas is like this when we finally meet them.
Genius Bonus: "Vanitas" is a term that refers to a work of art associated with the transience of life; the trademark of such a work is to contrast symbols of wealth and prosperity with symbols of death. For a story about vampires and mortals, to name a character and its book after such a term is fitting.
Most Wonderful Sound: For the English dub, Zeno Robinson's voice for Vanitas has been well received by many, especially the calm, soothing, seductive tone he uses whenever Vanitas is putting on a gentlemanly facade or his more sultry moments. The higher pitched, brattier voice he uses for Vanitas' cocky bravado and angrier moments are also a delight to listen to.
Stoic Woobie: Vanitas is a mix of this and Jerkass Woobie. His jerkass side does seem to wane though, especially when he's with Noe.