Faustina, in some very subtle, not automatically obvious way, has some similarity to Hot Pink that Bellamy is unconsciously aware of. Could be in appearance—maybe Hot Pink had the same kind of huge grin that Faustina has. Or it could be something more than skin deep, like them having the same favorite soda. Another possibility that I think is just subtle enough is how they sit in a chair. Both fold one leg under them or have their knee pulled up or maybe just sitting cross legged, stuff like that