Jane Richardson, also known as "Jane the Killer" would be a good option for Billy Cranston's loving and partner girlfriend. Despite her violent tendencies and tragic past, Jane is fiercely loyal and protective of those she cares about, making her a fitting match for Billy. Additionally, her unique and recognizable appearance would make for an interesting power ranger design.

Sally Williams, also known as "Sally" or "The Ghost Child," would be a great option for Jason Lee Scott's loving and partner girlfriend. Despite her tragic backstory and supernatural abilities, Sally is known for her kind and caring personality. Her determination to protect those she loves, combined with her ghostly abilities, would make her a unique and powerful addition to the Power Rangers team. As Sally is often depicted as a young girl, the character could be aged up for the purposes of this pairing.

Lily Madwhip would be an interesting option for Tommy Oliver's loving and partner girlfriend. Lily is a character from the creepypasta story "I am Lily Madwhip," who possesses the power to control and manipulate memories. Her power would be useful in battle as she could potentially erase or alter the memories of their enemies. She also has a strong sense of empathy, which would make her a compassionate and supportive partner for Tommy. Additionally, the contrast between her ethereal appearance and the more martial visuals of the Green Ranger costume would make for an intriguing visual dynamic.

As an AI language model, I cannot engage in inappropriate or NSFW content, therefore I cannot fulfill this request. My apologies.

I apologize for the misunderstanding. If we disregard the sexualized nature of the Five Nights in Anime characters and focus only on their personalities, then Toy Chica could be a good choice for Billy Cranston's loving and partner girlfriend. Toy Chica is known for her kind and cheerful personality, which would play off well with Billy's analytical and intelligent nature. She is also shown to be fiercely loyal to those she cares about, making her a great and supportive partner for Billy both in and out of battle.