Parody Anime

A manner movie shown before Re:Zero kara Hajimeru Isekai Seikatsu - Memory Snow. It features the cast in chibi form speaking to the viewer asking them to behave such as by turning off cellphones and to avoid smoking inside the theater.

On a bright, peaceful day, siblings Nunnally and Lelouch Lamperouge take a moment to relax under a tree. When Nunnally asks him to tell her a story, Lelouch, who is unflinchingly resolute in doing his utmost for his sister, makes unique use of his Geass ability, breaking barriers to tell the most entertaining story he can.

Awakening alone under the tree, the previously blind Nunnally finds that she can see again and immediately spots a strange rabbit that resembles Anya Alstreim, the Knight of Six. The sight of this rabbit sends Nunnally falling down a hole, leading her to a colorful wonderland. Narrated by Lelouch himself, Code Geass: Hangyaku no Lelouch - Nunnally in Wonderland follows the lost Nunnally as she searches for a way back home, meeting a slew of colorful, familiar characters along the way.

(Source: MAL Rewrite)

Spinoff of Ansatsu Kyoushitsu and continuation of the anime film short.

In this world, Koro-sensei is the Demon King while the students of class 3-E are cast as heroes who must defeat him. The students learn swordsmanship and sorcery at Kunugigaoka Magic School. Their strange adventure begins!

(Source: Official page)

More crazy antics abound as Nozomu Itoshiki, a.k.a Zetsubou-sensei, who is the worlds most negative person, tries to teach class 2-H about how life is filled with despair and darkness. A harder task than it first may seem, with his students being far from ordinary themselves, including the likes of the most positive girl he has ever met, his very own stalker, a foreign exchange student with split personalities and a perfectionist acting class president, due to the fact the real class president can't be seen by anyone, among others.

(Source: Anime News Network)

According to the Kuroshitsuji website, there are 6 OVAs included in the DVD releases.

DVD 2: Ciel in Wonderland (Part 1)
This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story.

DVD 3: Welcome to the Phantomhive's
This is meant to be like a simulation game. Elizabeth invites a lady (perhaps the viewer) to join her at a ball held at the Phantomhive mansion.

DVD 5: The Making of Kuroshitsuji II
This is a Hollywood style documentary with behind the scenes interviews with Sebastian, Ciel, Claude and Alois etc.

DVD 6: Ciel in Wonderland (Part 2)
This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story.

DVD 8: The Tale of William the Shinigami
William and Grell have to train new shinigami and reminisce about when they were training partners.

DVD 9: The Spider's Intention
The life in Trancy household and how those work under Alois is caring for him.

(Source: MAL)

The Matsuno sextuplets (leader Osomatsu, wannabe tough guy Karamatsu, straight man Choromatsu, cynical Ichimatsu, cheerfully stupid Jyushimatsu and lovable spoiled Todomatsu) are now in their 20s, still living together in the same house as NEETs. Their neighbors still include such eccentric characters as fish market idol Totoko, loud bucktoothed troublemaker Iyami, tiny rival Chiba, wacky inventor Dekapan, and giant mouthed glutton Dayon.

Join the Matsuno siblings as they overcome mundane hurdles in their daily lives, such as finding employment, figure out who should pay the bar bill, and who should get the extra pastry!

(Source: AniList.co)

Teekyuu is based on a sports comedy manga of the same name featuring four high school girls who belong to a tennis club.

It's hard to take over the world, and the enigmatic Il Palazzo, head of the ACROSS organization, knows this, so he aims to start small by conquering the city of Fukuoka. Two young officers, the Excel and her partner Hyatt, are tasked with executing this plan, but standing in their way are the City Security workers, a group consisting of three (mostly) normal guys, a very severe girl, and some robots. Regardless of simplicity, Excel and Hyatt always manage to screw up their missions, which usually result in death and lots of destruction.

Heppoko Jikken Animation Excel♥Saga chronicles the elaborate troubles that the ACROSS officers get themselves into, as Excel and Hyatt never fail to do their jobs improperly.

(Source: MAL Rewrite)

Imamiya Satoshi, "Sasshi" to his friends, has grown up in the Abenobashi Shopping Arcade in Osaka, along with his childhood friend, Asahina Arumi. Now, all that was stable in his life is in ruins. His family's bath house has closed and been torn down, and Arumi's family is moving to Hokkaido - and taking her with them. In the midst of all this, something happens to the framework of reality, and Sasshi and Arumi slip into a weird parallel world. It's still Abenobashi, but not their Abenobashi. Strange things are afoot, and Sasshi must find out their meaning, in order to reach a goal that he barely understands.

(Source: AniList.co)

A series of shorts featuring Index-tan.

The first and second seasons of Hetalia.

What if nations were people? What traits would they have? What would this mean for historical events?

Hetalia Axis Powers takes these questions and runs with them, personifying countries into characters. The show takes a comedic and light approach to politics and historical events while educating the viewer.

Taking place primarily during the events of World War I and World War II, the story focuses on the Axis Powers and occasionally throws the spotlight onto the tumultuous relationship between the Allied Forces. The Axis Powers feature the titular character North Italy, who is clumsy, carefree and loves pasta; Germany, who is very serious but easily flustered; and Japan, who is stoic but has bizarre interests.

Based on Hidekaz Himaruya's widely popular webcomic turned print manga, Hetalia Axis Powers is a historical comedy that pokes lightly at culture, examines the relationships between nations and breathes fun into history.

(Source: MAL Rewrite)

In a world where ESP is common, only three people have them at the highest possible level. Those three are the special ESP team, The Children. The Children work for BABEL, a special ESPer organization committed to stopping crimes before they happen. Kouichi Minamoto is assigned to watch over them, and he'll need to, because three superpowered ten-year-olds are a problem on their own.

(Source: Sentai Filmworks)

Rei Ichidou, Gou Reietsu, Kiyoshi Shusse, Jin Daima, and Dai Monohoshi are five mischievous boys attending Ichiou Junior High. Each with an eccentric personality and a knack for chaos, they've earned a reputation as the infamous "Kimen-gumi."

One day, new transfer student Yui Kawa and her friend Chie Uru encounter the group and soon find themselves drawn into their antics. Around them are other colorful cliques—from the handsome "Iro Otoko-gumi" led by Shou Kireide, to the delinquent "Ban-gumi" led by You Nihiruda, the athletic "Ude-gumi" led by Kai Undou, and the tough girl squad "Onna-gumi" led by Jako Amano.

As time passes and a new spring begins, the everyday lives of these eccentric students unfold in a lively and comedic school story.

(Source: MAL News)

What if Jesus and Buddha were living on Earth in modern times? What if they shared an apartment in Japan? Saint Young Men is a movie about the daily lives of Jesus and Buddha, focusing on different element of modern life.

Luffy and his crew take on the Villain All-Stars in a game of soccer in order to become the Dream Soccer King. The game comes down to a pk tie-breaker shoot-out with Coby as goalie and Helmeppo refereeing.

(Source: Anime News Network)

Short specials that aired on the official website.

The story deals with those in this world who dwell in the dark, invisible to the naked eye. From time to time, these figures bare their fangs and attack people. Inferno Cop is a messenger of justice who came from the depths of hell to protect people from them.

(Source: Anime News Network)

Toaru Kagaku no Railgun specials that were released on the 1st and 5th Blu-ray and DVD volumes.