>>533790471. They are LITERALLY brown- but I suppose you meant that Lopunny evoke many blonde bimbo stereotypes, which is due to Playboy being associated with that type of women.
2. They were originally found only in Eterna Forest. Them being found in colder climates is a Gen 8 thing pushed to excuse not having them in base SwSh (for the sake of CINDERACE).
3. Buneary is a ragdoll, you can even see the female Preschooler from XY with one. Lopunny is a jointed bunny doll that is derived from a similar type of teddy bear. Pic related.
4. Game Freak were probably thinking of The Velveteen Rabbit as the base concept for the line... or maybe they thought of bunny girls first and used that to justify it.