Ranma, raised to be a man among men, has a bit of a problem: he is half woman! While training in China he fell into a strange magic spring at Jusenkyo. Now, he is eternally cursed to change into a beautiful woman whenever he is hit by cold water, but that may be the least of his problems; his father has betrothed him to marry! There's never a dull day for Ranma as he attempts to find a cure for his curse, train to become stronger, and grapple with the fact that half of himself may be more feminine than his fiancée!
When Makoto saw Kotonoha on the train one day, he fell in love at first sight. Luckily, his classmate Sekai’s nosy personality ensures him an introduction to his crush, and soon the two begin to date. However, Kotonoha isn’t the only one with eyes for Makoto - a fact that any horny teenager would be delighted with. With endless temptations, lies and heartbreak at every turn, Makoto and Kotonoha’s relationship will soon be put to the ultimate test...
The year is 1925 and Japan is still a country with socially backwards views, particularly on women's rights. One young girl named Akiko Ogasawara decides to fight for equality in her own way - by forming a girls' baseball team! She soon enlists her good friend Koume Suzukawa, and it's now up to the two of them to put together a team of like-minded and spirited young ladies. Under the able and enthusiastic tutelage of English teacher Miss Garland, the girls will need to bond closely, learn well and practice hard if they are to stand their ground against boys' teams and show a misogynistic society exactly what they're made of... while having some fun in the process.
Sixteen-year-old Takeshi Chimatsuri is the son of a famous samurai and on his way to becoming one himself, but an old family feud soon makes his life much more difficult. For his father, long ago, stole a family heirloom from a powerful ninja that he defeated – and now, his two granddaughters have arrived to take it back. From invisibility potions to their naked bodies, the two girls will stop at nothing to get back what was taken from their family!
On a day like any other day, Cacao (a chocolate-loving student of magic) awoke to find himself next to a mysterious girl ... made of wood?! Named Hinano, the green-haired beauty wasted no time in professing her very one-sided love to Cacao, much to his dismay. Now, in this colorful world of magic and technology, Hinano must do everything in her power to to win Cacao's love, even when hindered by a variety of obstacles including martial arts twins, bizarre teachers, and suitors after her own heart!
I can't comment on the subbed version of these because I haven't seen them, but after Ramna 1/2 finally ended, the team who did the dubs for it turned around and did Trouble Chocolate. In doing so they changed a lot of what Trouble Chocolate is by itself, and turned it into a really weird alternate reality of Ranma. All of the voice actors played characters who were somehow similar to their counterparts in Ranma, and some of the dialogue was changed in places to pay homage to everyone's earlier work. And oddly, it works. If you liked Ranma, check out Trouble Chocolate.
In a world where magic is a reality, the young Louise is at the bottom of her class. Dubbed "Zero" by her classmates at Tristein Academy (due to her zero success rate for magic), Louise (along with all first year students) was charged with summoning a familiar; and instead of a cute magical creature, the familiar arrived in the form of... Saito Hiraga, a normal Japanese boy who was abruptly teleported from his own world?! Can both Louise and Saito come to terms with their new and complicated "relationship" and (more importantly) help Saito find a way home?
Both have a focus on a developing relationship between two people who are stuck together through circumstances beyond their control and who are trying to understand how to get along with each other, and if they even want to get along in the first place. In both shows, the female protagonist is violent, exceedingly jealous, and constantly pushing away the male protagonist despite the fact that deep down, they know they want to be with him. Both male protagonists have a series of women who fall in love with them and chase them down at all costs, often resulting in awkward situations and anger and jealosy from the female protagonist. In addition, both male protagonists develop a strong desire to protect the female protagonist, despite the fact that the female protagonist could probably take care of herself. And althought Zero no Tsukaima takes place in a magical world, while Ranma 1/2 takes place in modern Japan, both have strong elements of magic and fighting that are essential to the plot. The humor, romance, magic, harem, and fighting elements make these shows a natural pairing. If you liked one, you will probably like the other.