Frisk has brown hair. She also has yellow orangy skin. She always keeps her eyes closed.
Flowey- The first person to meet her in-game
Toriel- The second person to meet her in-game also took care of her.
Sans-One of the last bosses and her somewhat friend.
Undyne-One of the first bosses.
Asriel-Their relationships are currently unknown
Frisk is human she lives on natural recources
Sorry,too many google searches