Fleur is a pleasant Lopunny who is trying to be the best example she can be for the denizens of the Sanctuary. She is very determined when she has a mission and looks to do whatever she can for the good of those under her. Back then, the Lopunny was very wary and untrusting, but she has changed for the better, putting forth trust in the good will of all Pokémon.
Sometimes Fleur can jump to conclusions too hastily, which can make relations with certain characters worse.