OK, ages, ages ago (2010 maybe?) I posted a version of Lea on this thread. I was still pretty new to the game and it wasn't mechanically well done... Plus we've seen Lea in action more, in Changes.
This is a somewhat conservative version of her; it assumes that the most impressive stuff she does in Changes involves drawing on Sponsor Debt to Mab (I'm assuming that's part of what the whole "indulge yourself" bit from Mab is).
Lea (Deep One)
High Concept: The Leanansidhe
Other Aspects: Harry Dresden's Faerie Godmother; Reforged by Mab; Most Vicious Creature of Winter; A Deadly Muse; Millennia of Bargains
Skills
Epic: Lore
Fantastic: Conviction, Performance
Superb: Contacts, Discipline
Great: Deceit, Presence, Rapport
Good: Athletics, Intimidation, Weapons
Fair: Alertness, Empathy, Investigation, Scholarship, Stealth
Average: Burglary, Endurance, Fists, Might, Survival
Stunts
The Social Graces (Empathy)
Poet (Performance)
Muse's Gift (Performance): If Lea spends time helping another artist, she can allow that artist to take Sponsor Debt to her on Performance rolls.
Powers
Evocation [-3]
Mastery of Transformation [-1]: use transformation/disruption with evocation's speed and methods
Refinement [-24]
Thaumaturgy [-3]
Unseelie Magic [-2]
Greater Glamours [-4]
Inhuman Speed [-2]
Mythic Recovery [-6]
Supernatural Toughness [-4]
The Catch [+3]: cold iron etc.
Specializations
Evocation – Elements (Air, Fire, Spirit, Water); Control: Unseelie Magic +7, Air +5, Spirit +3, Water +1; Power: Unseelie Magic +6, Air +4, Spirit +2.
Thaumaturgy – Complexity: Transformation/Disruption +5, Conjuration +3, Psychomancy +1; Control: Transformation/Disruption +6, Conjuration +4, Psychomancy +2.
Focus Items
Ring: +1 Offensive Control and Power with Unseelie Magic
Ring: +1 Complexity and Control with Transformation/Disruption
Stress
Mental oooo +1 mild consequence
Physical ooo(oooo) Armor:2
Social oooo
Total Refresh Cost: -49
Remaining Refresh: -11
Notes: Her rotes with Unseelie Magic would be 13 shifts offensively, 12 defensively - comparable to the best of the Senior Council. She's a master of transformative magic, able to do extremely complex transformations at evocation speed.
Greater Glamours arguably doesn't give her anything that she can't do already with spellcasting... but I felt that she should have it, being a really powerful fae.