I'm mostly into Mage the Awakening.
Dresden Files Crossover Scenarios:
It would be interesting to see the new player entering the DF. As around 80% of mages in WoD violate the 7 laws by the very nature of their powers (100% during initiation) it should be an interesting read. Taking into account that the greatest paradox he would encounter is an EMP field and experienced mage will quickly become one of the major players.
a) A mage is drawn by accident
Some poor soul is drawn through the accident into the DF. it could be an investigation/Interruption of the Abyssal Summoning, an expedition gone wrong, an interrupted summoning spell.
Example: A member of Adamantine Arrow was fighting a summoned creature, running amok, when it was summoned away taking the mage with him. He/She is a Disciple of Demon Wind, Mastigos with dots in Mind, Space and fate. Physical->Mental->Social Traits. 35-50 exp points to flesh out.
b) The Mage is sent by the higher power.
It could be an Archmaster creating an awakened colony on the far shores, free from the paradox and Exarches. Or a shadow god looking or the greener pastures.
Example: Free Council scholar, experienced summoner got an offer he couldn't refuse. He is a neocologist Thyrsus, specializing in Spirit, Life and Matter. Mental->Physical->Social, 70-80 exp. Lots of summoner merits.
c) It's a deliberate invasion by mage/mages desperate to get out of fallen world, for reasons.
A mystorium censor finds an archaeological site containing the gate to the DF. The expedition is mounted by all pentacle orders (whole cabal is going). For drama you can have the gate destroyed by the Seers Of the Throne after expedition leaves. (this can work as quest)
If you want to go with the horror rote just stick Ahriman (Boston Unveiled) or Cadere (Christophe Valder from Night Horrors) in the body of Harry Dresden. Now that would be a story (hint: both are insane warlocks).
1a) Dresden Awakens after (or shortly before) killing his mentor. Obrimos is closest to canon, but going with other paths would be more fun.
1b) Dresden is transported to the WoD. Probably through something to do with outsiders. A real wizard making public advertisement won't cut with the Guardians of the Veil. Concilium made of necromancers, warlocks, chronomancers and predators won't cut with Dresden.
1c) White Council finds the way to the WoD and they send some wardens through.
Some points that need clarification:
Nevernever is the Shadow Realm/Underwold/Astral Realm rolled into one. treat it as an Astral World tied to the Physical world. Gountlet is present as normal.
Power that is used in DF by mages and fairy is essence. There are no hallows or mana, yet.
Abyss can't reach through the outer gates, yet.
Name: Harry Dresden (At the beginning of series)
Virtue: Prudence (Never Giving In)
Vice: Wrath (Fuego!)
Path: Theurgist (can't work spontaneous magic)
Order: White Council
MENTAL
Inteligence 3, Wits 3, Resolve 4
PHISICAL
Strength 3, Dexterity 2, Stamina 4
SOCIAL
Presence 2, Manipulation 2, Composure 3
Mental SKILLS
Academics: 2, Crafts 2 (magical), Investigation 5 (paranormal), Occult 4 (Monsters), Medicine 2 (Fist Aid)
Physical Skills:
Athletics: 2 (running), Brawl 2, Drive 2, Firearms 2, Larceny 1 stealth 1, weaponry 1
Social Skills:
Animal Ken 1, Intimidation 2 (implied threats), Persuation 1, Cosialise 1 (vampire parties), Streetvise 2, Subterfuge, 2 (misdirection)
HEALTH: 9
WILLPOWER: 7
Morality: 5
Derangements: N/A
Flaws: Notoriety
Size: 5, Speed 10, Defence 2, Initiative 5
Influences: Fire 2, Simpathetic Links 2
Essence: 12/3
Merits:
Allies (Blacckstaff, Chicago Police, Faerie Godmather, Wild Fae), Contacts (Police, Wild Fae), Resources 2, Destiny 5 (Universal Troublemaker), Language (Latin), Pleasing Aura 3, Iron stamina 2, Staff Fighting 1, Relic Creator 4, Library 5 (spirit of air and Intellect), Alchemy (External) 4, Evocation (Spirits/Fae) 4, Sacrifice (Spirits/Fae) 1, Warding (Threshhlds) 3
Dread Powers
Enhanced Sences 1 (Hearing), Gremlinize 5, Read Aura 2 (soulgaze), Longevity 4, Wizard Sight 3
Rotes
Fuego 4, Forzare 4, Aparturum 3, Dormius 2, Circle 2