Kirsi/Infobox
From Tenebrous Isles
- Name: Kirsi Lahti
- Apparent Age: 20s
- Age: 22
- Place of Birth: Denver, Colorado
- Temperament: Chatty, quippy, competitive, and fierce when she needs to be
- Mantle: Valkyrie
- Status: New-in-town fledgling Valkyrie
- Occupation: Security and Self-Defense Instructor
- Languages: English, Finnish
- Alts: Noemi (Emissary of Power)