|Alias||The Black Swan|
|Anime debut||Episode 1|
|Japanese voice||Ayana Taketatsu|
|German voice||Tanja Esche|
Tsugumi Sendo is one of the characters from the anime Guilty Crown and is 14 years old. She is an excellent hacker who acts as the operator for the guerrilla resistance group "Funeral Parlor." Her void is a hand scanner that makes an exact duplicate as the original and controlled remotely.
She is very brash and cheeky and speaks unreservedly even to the leader, Gai. Her catchphrases are: "Aye!" (roger), and "Nay!" (negative). She expresses a cheerful personality.
She has a petite stature along with a black hime cut hairstyle and grayish-blue eyes. She is always seen with an electronic headband that resembles "neko" ears. She is first seen at the temporary base of operations in a Funeral Parlor trenchcoat attire. When engaged in battle, she is seen in a hologram hub wearing a dark blue and gray plugsuit supervising the battlefield and Ayase's vitals. After the Second coming of Lost Christmas, she normally dons a maid outfit or school uniform.
PlotShe is first seen standing infront of Shu right after Gai saves him and takes Funnell away from him, leaving Gai and Shu alone. She is seen a second time, warning everyone of the enemies that were approching. She is seen later telling Ayase where her next targets were. However, Ayase asks her to findcloser Daryl. Tsugumi saves her from that by ejecting her from her craft. Later, Tsugumi teases Ayase because of how she reacted due to Gai's statement, saying her "heart soared to the top of the charts". Tsugumi is later seen at the meeting shouting "Aye-aye!" as the whole of the Undertaker cheers due to Gai's plan to rescue the hostages. After the fight commences, Tsugumi tells Ayase to take care of her 'babies' and after is seen watching as Gai offers Shu to join them. She later helps Gai hack into the GHQ's main system to block the security cameras, to help him save Kido. She is seen watching with everyone else in the Undertaker as Gai introduces Shu to them. Later, Tsugumi watches in amusement as Shu tells Ayase that he doesn't want to cause her trouble because she is in a wheelchair, only to get his butt handed to him afterwards. After Shu's mock battle, Tsugumi informs everyone that the Leukocyte was fired at Point Delta (the area where Gai was). Everyone in the room is worried that Gai is dead until they hear his voice. They regroup and form a plan to destroy the Leukocyte. Tsugumi tells Gai that they have 30 seconds before it struck Japan. However, Shu saves them by destroying the Leukocyte. Tsugumi meets Daryl and begins to develop some feelings for him. It was shown that she was always alone and have to play by herself but later met Gai and joined "Funeral Parlor".
Tsugumui's void is called Hackers Interface. Her void enables her to scan someones or somethings body and then create a double that she can control. An example of this is when she used her void to copy a doppleganger of herself.