Rando Musashi is a tough guy, an obnoxious karate star, the school troublemaker and... the most popular girl in school?! Rando was riding the bus home one day when a sudden crash resulted in a horrible wreck. He was immediately taken to intensive care under plastic surgeon extraordinaire Dr. Manabe, who treated Rando's maimed face. Yet unfortunately Dr. Manabe mistook a picture of Rando's school crush for a picture of how Rando looked before the accident. Rando awakens from a coma a full year later to find that he now has the face of Rina Kurimi, much to his dismay! He rushes out of the clinic in terror, only to run into Rina herself, who mistakes Rando for her twin sister that ran away years ago. Now living at Rina's house, Rando is now forced to play the part of Yuna Kurimi while at the same time searching for the real Yuna and attending school. Even with the help of Dr. Manabe, Rando has his work cut out for him!
Despite the obvious fact that both share the same author and artist, both shows are about protagonists hiding a huge secret that cannot be revealed no matter the cost, with hilarious results. Both are of course, doing it for the girl they love.(Which looks very similar in appearance)
Even the main hero and heroine share similar personalities. If you like Pretty Face, i can gurantee you Mx0 will be enjoyable and vice versa. The only thing Mx0 does different is that it replaces the gender bending aspects with magic, so if thats a big deal to you, do consider it as well.
both titles have the main character have a big secret in Mx0's case the person has no magic and in pretty face he lives as a girl while hiding the fact that he is a guy
Fumizuki Academy is divided into classes ranked based purely on ability; Class A has laptops, reclining seats and ultimate comfort whereas Class F has to settle for a rundown classroom with rotten cushions and rickety coffee tables. Akihisa Yoshii has recently taken the placement exam and finds himself relegated to the lowly Class F along with many of his friends, and they’re far from impressed with their draughty facilities. Luckily, not all is lost as at Fumizuki, classes can declare war on each other to swap rooms by fighting with summoned characters whose strength is based on the users' test scores. As they dream of escaping their decrepit circumstances, the ‘idiotic’ students of Class F will try whatever they can to reach the dizzy heights of Class A’s luxury, even if it means taking on the entire school in an all-out summoning war!
The manga version of Baka to Test is just starting out but it's definitely worth checking out if you liked Mx0 and want some more school-life comedy with romance throughout (Even though for Baka to Test, the romance is either one-sided or the ones who love each other are oblivious).
It's also works if you enjoyed what bit there is of Baka to Test and want something else that's like it; Mx0 finshed and had a pretty decent run length wise (10 volumes). Both share some of the same humor and some fanservice throughout.
They also have an element that makes it different from a normal school comedy; magic in Mx0 and a strange Exam Summoning Battle for Baka to Test. Outside factors that add to the fun.
Both Ciel and Mx0 are quite similar as it revolves around the main character going to a school focused on magic. Also if you think about the characters, Kuzumi Taiga and Yvienne Magnolia they both entered the school under unavoidable circumstances. They can also be very silly at times but they can also be very serious when it comes to protecting their friends and family. So if you liked Mx0/ or Ciel you'll surely like the other as well.
They are written by the same person, so if you liked one you'll definitely like the other.
Honestly, I feel that the two lead characters are the same people in a different universe (somewhat like Cardcaptor Sakura/Tsubasa Chronicles).
Fifteen-year-old Tsukune Aono is average in every way; he has no hobbies, less-than-stellar grades and he's even flunked his high school entrance exam. His parents have managed to enroll him in a school, but it's no ordinary school! Tsukune will be attending the Youkai Academy, a place where monsters learn how to co-exist with humans! As the werewolves, vampires, witches and other monsters are required to retain their human forms, Tsukune - the lone human - is able to avoid their bloodthirsty gazes. However, he quickly attracts the attention of a number of devilish beauties including the vampire Moka, a busty succubus and even a young witch! It seems Tsukune's average life isn't so average anymore!