Spirit Knight
Crossover with Magic Knights of Rayearth:
Ryoga is shown to Nodoka as Ranma and the wedding is soon since Akane is pregnant. No one wants Ranma to tell the truth so when the age reducing mushrooms are found they plan to turn Ranma into a baby, and tell Nodoka she's Ryoga and Akane's. The amazons find out and decide to use this along with formula 110 to erase Ranma's memories so they can control her.
Kasumi protests but is belittled, this leads to her disappearance and it later turns out she found Tofu, went to med school and married him.
During a struggle to force a mushroom on Ranma she eats a 4 inch mushroom and becomes 4 years old. Because the change is so sudden she escapes. The mushrooms act on one's emotional and mental state so Ranma is 4 in all respects except memories. She wanders around awhile until she's injured somehow. When she wakes her doctor is Mirako Takashi.
Ranma breaks down when asked about her family and tells Mirako everything. Skeptical she brings in her family and finds Tofu and Kasumi. Everything shows that Ranma is being truthful and the Takashi's are horrified at Ranma's life. They decide to take her in and not contact anyone from Ranma's past. During her recovery Ranma and Mirako become close and Mirako decides to adopt Ranma. With the help of her family all records show Ranko Takashi is Mirako's biological daughter.
Ranko adapts to her new life but keeps to herself, alternating between depression and quiet. Over the years she develops a fighting style incorporating armed and unarmed fighting into a powerful art. The next door neighbor is the Shido family and 4 yr old Hikaru Shido makes it her mission to befriend and cheer up Ranko (with the full support of the Takashi's and Shido's) this is partially successful and she gets Ranko to open up.
Ten years pass and Hikaru is Ranko's only friend, at the Tokyo tower Ranko is pulled to Ceiphero with Hikaru, Umi and Fuu. She is the Knight of Spirit and her Mashin (Daxal) is a tiger (the Mashin helps her with the neko ken). During the final fight Ranko gets through to Zagato and Emeraude convincing them they can serve Ceiphero and be in love (this pep talk snaps Ranko out of her own self-pity). The Knights return home and Ranko starts to make changes. She becomes more active and happy, she takes an interest in things outside martial arts (I'm thinking singing and guitar), she truly accepts who and what she is.
Three years pass and the knights have visited Ceiphero now and then helping out with Autozam, Chizeta, and Fahren's encroachments and keeping the peace. A new enemy attacks all four lands and the Knights go to help. Being overwealmed by the brutality they bring in Family to help (Hikaru's brother are fighters, Fuu's family is organized, the Takashi's are fighters and healers).
This help turns the tide until a psychic probe finds out about Ranko's past and tricks the Hibiki's, Tendo's, Saotome's, Kuno's and Amazons into aiding them. Ryoga and Akane have twins a boy and a girl who tend to be subdued, they've taken hits from their parents for not doing things "the right way", and Nodoka is concerned over Akane and Ryuoga's behavior. As things progress the twins and Nodoka will become increasingly suspicious of their family. Part of this is becuase Ranko has become semi-famous among teens with her music and the twins adore her.
Akane has always known P-chan is Ryoga and they (with Nabiki) have been making Ranma's life hell. Durning the chisuiton adventure Ryoga destroys the kaisuifuu so Ranma can't unlock the curse. He finds out Akane asked Ryoga to do it, and Nabiki plans to use this to gain control of Ranma.
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Paths the story could follow:
