The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Judiela (1 member)
- Julie Latkje (2 members)
- Juppo (2 members)
- Kahn Marley (1 member)
- Karen (1 member)
- Karl (1 member)
- Kasumi (2 members)
- Katarina (1 member)
- Kate (1 member)
- Kathy (1 member)
- Keen (1 member)
- Keneth (2 members)
- Kevin (1 member)
- Kiaro (1 member)
- Kiba Windamier (2 members)
- Kidd (1 member)
- Kika (2 members)
- Killey (2 members)
- Kimberly (1 member)
- Kirkis (1 member)
- Kisara (1 member)
- Kobold accessories (1 member)
- Kobold accessories in Suikoden (0 members)
- Kobolds (8 members)
- Konrad (1 member)
- Kooluk Empire cards (2 members)
- Koroku (1 member)
- Krakens (3 members)
- Kuromimi (1 member)
- Kwanda Rosman (1 member)
- Kyle (2 members)
- Kyril (4 members)
- LaTiDo (1 member)
- Lance (1 member)
- Languages and scripts (2 members)
- Lao-Kwan (1 member)
- Laquila (1 member)
- Laskaris Liuis (1 member)
- Lathilda (1 member)
- Leader cards (350 members)
- Leknaat (4 members)
- Lelei (1 member)
- Len-Lien (1 member)
- Lena Suphina (2 members)
- Leo Galan (2 members)
- Lepant (2 members)
- Levi (1 member)
- Liberation Army cards (20 members)
- License templates (3 members)
- Light armor (2 members)