Student Number 31: Zazie Rainyday (ザジ・レイニーデイ, Zaji Reinīdei?) Birthday: 17 March 1989. The silent acrobat, and one of the most mysterious girls of the class. Nothing much is known about her, as she rarely associates with anybody, and even when she does, she rarely talks (she has spoken only eight times in the serialized manga thus far). What is known is that she is a member of the Nightmare Circus, the school's Acrobatic Club, and is seen directing a group of "monsters" or "spirits" (similar to No-Face from Spirited Away, the Angels from Neon Genesis Evangelion or possibly Hollows from Bleach) when she offered to cover for her classmates during the school festival, and gave Chao a tiny living dragon as a farewell gift. She also has been shown to see Sayo without the assistance of Negi or having a close relationship with her like Kazumi. According to Negi's Class Register, Zazie is also a member of the school's Magic Club, though whether this is real magic or stage conjuring is unknown. In the anime, she is shown to have proficiency in all kinds of circus tricks such as juggling, sleight of hand, and costume changing. She has dark skin, and has two particular face marks: a large teardrop under her left eye (strongly resembling the carnival character "pierro"), and a vertical line resembling a scar crossing the right side of her face. A splash picture of the cast shows her with claws growing from her fingers. She is sometimes seen with her pet bird, but more recently with her "friends" (the black spirit-monsters). So far, she is the least known of all the students in Negi's class and very little has been revealed about her. Zazie is one of the few students in Class 3-A who did not participate in Negi's sojourn to Wales and the Magical World. When Zazie's name is seen it is written in the Latin alphabet, rather than in Japanese. Similarly, Evangeline's name is also written with the Roman alphabet. This seems to indicate that, like Evangeline, Zazie isn't from Japan and is instead from a country which uses the Roman alphabet. This is backed up by the fact that Chisame referred to her as a transfer student in volume 2. (From Wikipedia)
Fujimaru's father works for the Public Security Intelligence Agency under its secret Third Division, aka Third-I, as its Vice Director. He was framed for the murder of Director Okita, and was on the run for some time as he sought to unravel the mysteries of "Bloody Monday." He is eventually found innocent, though he suffers several injuries during the series. In the second season, Ryūnosuke has gone undercover in a cult group he had infiltrated eight years ago in order to prevent a terrorist attack which has the potential to dwarf the "Bloody Monday" threat. He dies in Season 2 while trying to slow down the terrorists. He was a double agent and was known as 'Beast' among the terrorists led by Alexei (the shooter of the magic bullet). (Source: Wikipedia)
The ruler of the Gogol Empire, which is at war with the Jaicro Empire for control of the universe. He sends Dr. Gel to capture Dandy, claiming he is the key to the future of the universe. His appearance is that of a skull with miniature "planets" orbiting it. (Source: Wikipedia)
Tamo-san is Gintama's version of the real-life Japanese comedian Tamori-san.
Setsuna is a Shinmeiryu swordswoman from Kyoto who was taken in by Eishun Konoe, Konoka's father and the leader of the Kyoto Mage Association. She is childhood friends with Konoka and her protector. Setsuna spends the beginning of the series being relatively cold to Konoka, wishing to protect her from the shadows due to not forgiving herself for being unable to save Konoka when she almost drowned when they were kids. She does eventually open up to Konoka after the Kyoto arc and begins calling her "Oujo-sama" and "Kono-chan". Setsuna's pactio, Sica Shishikushiro is a wakizashi which she can summon and multiply at will to strike targets like missiles. Due to her training she's also skilled in anti-demon arts and is the one who taught Negi how to create shikigami from paper. Setsuna is a hanyou like Koutaro, in particular a crow. She was expelled from her people because white wings are considered a bad omen, and it was implied by Evangeline that she is an albino using hair dye and contact lenses to appear human. A running gag within the series is that Setsuna and Konoka appear to have romantic feelings for one another, yet Setsuna will deny it whenever she and Konoka are stumbled upon in romantic situations or asked about her preference.
Chaos is the king of the country of Tao. He has god-like powers and a fan made up of Sakura's memory feathers. He is actually completely made up of feathers.