Some time after the culprit behind the deaths of several Shadowhunters, particularly former Circle members, was revealed, Kadir helped organize the capture of Camille Belcourt. When Alec Lightwood and the others got into trouble with Camille and Lilith, he sent a fire message asking the Conclave for backup, and Kadir was among those who responded. He and Maryse were the ones who went to the roof to check on Jace and Sebastian and found them missing.
In 2012, Kadir attended Inquisitor Horace Dearborn's Council meeting which ended up passing The Registry. He sat next to Diana Wrayburn and the pair conversed back and forth during the meeting — both expressing their disgust with the display Dearborn was making of the Larkspear children and of Diego Rosales, Rayan Maduabuchi, and Divya Joshi.
Kadir later went to Julian Blackthorn's war council against the Cohort. During the Cohort's parley, Kadir was originally inside the city but called for the gates to be open along with the others and soon joined the battle. After Julian and Emma Carstairs rose up as True Nephilim, Kadir was a part of the barricade meant to prevent the Blackthorns from approaching them in an attempt to keep them safe.
He was also at the meeting to sentence the Cohort members and elect a new Inquisitor and Consul. After they were exiled from Idris, he became part of the crisis team in New York working on rebuilding and how to move forward.
- City of Fallen Angels (first appearance)
- City of Lost Souls (mentioned only)
- City of Heavenly Fire
- Queen of Air and Darkness