Kallen is one of the most important characters in the Code Geass series. She is the start fighter for the Black Knights and is present throughout the entity of the series. Kallen is a serious character who shows very little of her sensitive side throughout the show. She attends school with Lelouche and is the same age, but tends to miss most days due to her involvement with the Black Knights. In order to keep her double life a secret, she pretends to be sickly to her teachers and classmates. She is also half Japanese and half Britinian, although she rejects her non-Japanese heritage.
10 She Has Her Own Light Novel
While it will likely never make it's way outside of Japan, Kallen does have her own light novel. Translators have stated that the light novel focuses on the fact that Kallen has to live a double life and takes a closer look at the struggles of her involvement with the Black Knights.
The novel only consists of two short chapters. Kallen is also featured in the fan book Queen that focuses on the female characters of the series, although it doesn't add much substance to the overall plot.
9 She Loves Plushies
A small detail that many fans don't know about Kallen is that she actually seems to be rather fond of stuffed animals. Despite the fact that she is used to war, many fans forget that Kallen was just a normal school girl at one point.
Kallen actually has a stuffed animal in her room that she has even named Tabatacchi. This small element helps to show Kallen in a softer light than when she is piloting or having to carry out missions for Zero.
8 Tragic Family
Kallen was born out of an affair between a Britannian man and her mother. Once the war began, her mom asked for her dad to adopt her since his actual wife was sterile, and he needed a heir for his estate.
Kallen now lives with her dad and her stepmom. Kallen's mom refused to never see her daughter again and took up a job as a maid where she is regularly abused by the stepmom and has even been abused by Kallen in the past.
7 She is Incredibly Loyal
Lelouchevaluated the members of the Black Knights on several different subjects to determine where they would be most useful. Kallen was one of the members he evaluated and surprisingly placed her loyalty to the cause at 100 out of 100.
Lelouche notes that Kallen has unwavering loyalty and would rather die than turn her back on her comrades or her beliefs. This can be seen throughout the series as Kallen is more than ready to die in several harsh battles.
6 She Makes High Grades
While Kallen is absent from schools for a good portion of the year, she is shown to have above-average intelligence. She is one of the top performers at Ashford Academy and has no problem coming back to school and acing her classes.
During her time with the Black Knights, Kallen is shown to be able to make and work with new strategies on the fly and even has some diplomatic abilities. Kallen may not be on the same level as Lelouche, but she is one of the brightest characters in the series.
5 She Is Extremely Aggressive
One thing that many fans notice about Kallen is that she is extremely aggressive in her fights. Kallen gets up close and personal with her opponents and shows little to no mercy no matter who the opponent in front of her is.
This can also be seen in the scene where she pulls a knife on Lelouch while she is in the shower. Kallen has no problem killing to protect her identity and is more than willing to even get rid of her classmate if the need arises.
4 Kallen Was Inspired by Her Brother
Kallen's brother Naoto was one of the members of the rebellion and lost his life while fighting for his country. Kallen was close to her brother and looked up to him, with his death coming as a shock to her being one of the main motivations for her hate towards Britannia.
Kallen doesn't develop close relationships with anyone other than Lelouche and her brother. This may be due to the fact that those she has gotten close with have ended up being killed in the line of duty.
3 She Becomes a Normal Student
After Zero kills, Lelouche Kallen quits her work as a member of the Black Knights and actually returns to school. Kallen is able to act like her true self and stops acting as if she is sick all the time now that she can attend classes regularly.
Kallen does return to the battlefield once more in the sequel movie, where she is overjoyed to find Lelouche alive. It is shown that none of her abilities have deteriorated during the time she lived a normal life.
2 Her Nickname Means Queen
Lelouch gives every member of his force a nickname to use when they are all on the battlefield. Kallen gets the nickname Q-1 which means queen as Lelouch sees her as one of the most important pieces on his board.
Kallen is easily the most skilled member of the Black Knights and is one of the few reasons Lelouch is able to succeed in his plans. Kallen is the character that actually helps them turn the tide of the war.
1 She Loves Lelouch
While Kallen does kiss Lelouch in the show and comes on to him several times, the drama CD with her poem in it actually reveals just how in love she is with him. If Lelouche hadn't rejected her and taken his reign as an evil king, Kallen would have died for him.
Lelouch seems to have feelings for her as well, as he doesn't want her burdened by being in love with someone who will ultimately be sacrificed. It is unknown if Kallen ever moved on from her feelings for him.