According to Blitzcrank's "Fleshling Compatibility Service," a dating service made by Blitzcrank, Katarina and Garen make a perfect couple, but are not officially together. Fans have since been joking about their relationship.
The sixth issue of the Journal of Justice states Garen's family name is Crownguard, and every member of his family has joined the Demacian armed forces. His father and mother, Marcus and Lilia, are officials of the legislative Demacian Council. His younger sister Lux joined the military when she was thirteen.
Garen is a childhood companion of Jarvan IV, the crown prince of Demacia.
When Jarvan was captured by Noxian forces, Garen led his Dauntless Vanguard through enemy lines and rescued Jarvan before he could be executed.
Garen once protected Katarina when she came to Demacia to protest about High Councilor Heywan Relivash's conspiracy in Kalamanda along with Jarvan IV