Gandalf in Arnor has exactly the same abilities as his Gondor's version.
But Gandalf in Ered Luin has completely different skills in 3.8.1 and his form is just about 60 years younger than Gondor's version.
Ered Luin version of Gandalf probably will be in new version only temporarily in dwarves spellbook with three abilities.
Arnor could be a good way to get permanently this Ered Luin's version. Arnor has hobbits archers as mini-faction, so this form will certainly suitable for Arnor, Gandalf can make fireworks and they will be happy.
My idea for Gandalf in Arnor:
-All abilities from Ered Luin version of Gandalf, except Burning ability. He have a different ability "Mount/Dismount" from Gondor's version.
-Voice and staff from hobbit movie
-Gandalf will have only staff(Gandalf found sword Glamdring in hobbit story).
What do you think about this idea?
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Edit by Tiberius OgdenWell, my suggestion is:
Gandalf for Arnor1) Wizard blast (not cranky, but the same blast like Gandalf for Gondor has)
3) Blinding light (former Ered Luin Gandalf spell)
5) Mount/dismount
7) Fireworks (the same ability like Gandalf for Dwarves has)
10) Flame of Anor (former Circle of fire)
and he will hold only staff, because Glamdring is against lore (problem with time), his voice will be from Hobbit movies.
So we will have the three different mass slayers (Gandalf for Gondor, Gandalf for Arnor and Gandalf for Dwarves for some time) and each of them will be unique but his role will be the same.