Kanon Maldini

Kanon Maldini (カノン・マルディーニ, Kanon Marudīni), 28 years old, is a subordinate of Schneizel El Britannia and an Earl of Britannia. As his right-hand-man, Kanon is shown to be extremely loyal to Schneizel, however it doesn't stop him from voicing his differences in opinions in cases; such as Schneizel's attempted coup d'etat to Emperor Charles and destroying the Damocles while Nunnally is still there. Kanon is not a person who is too rigid. He makes a joke to Milly Ashford about being Schneizel's assistant in both public and private matters, only to wave it off and claim that Schneizel likes to keep weird people around.

Second Season
Kanon is first shown up in episode 3 of second season, when Suzaku enters battlefield among Britannia and E. U., then he is shown accompanying the 2nd prince to Chinese Federation. From this point, he continues to be seen at Schneizels side, and is shown having a friendly relationship with Nina Einstein. After Suzaku agrees to meet Lelouch alone at the Kururugi shrine, he is revealed to have followed Suzaku there (alongside the Glaston Knights in order to investigate and capture Zero) and obtains conclusive evidence not only of the masked terrorist's identity, but also the existence of Geass. His presence makes Lelouch believe that Suzaku betrays him.

After the Second Assault on Tokyo Settlement, Kanon and Schneizel come to Black Knights' headquarters in order to pick up Cornelia and make a truce with them. When the truce is success and Black Knights agree to disobey Lelouch, Schneizel then announces his ambition to acsend to the throne of Emperor, Kanon notes that he has finally made up his mind. He is later shown to be among the faction of Britannians who oppose Lelouch and side with the Black Knights During the battle above Mt. Fuji he is against Schneizel's decision to arm the F.L.E.I.J.A. warhead to destroy Damocles as a means of killing Lelouch, calling it terrorism, and shocked that Schneizel would abandon his crippled sister. Regardless, he still follows Schneizel's orders, until Schneizel is Geassed by Lelouch and Diethard Ried is gunned down.

Kanon is also slated for public execution along with Tianzi, Xingke, Ohgi, Kallen, and others. They're all released when Lelouch is killed by Zero.

Manga
In the near end of the manga's storyline, he is killed by Schneizel instead of Diethard.