User blog comment:Ado edem/Next ultimate skin?/@comment-3974211-20130609133100

Morello specifically said "one", so I think that actually eliminates Udyr and Mordekaiser despite them being top of the polls (since they each have two abilities with E as the fourth letter).

Assuming "spirit" is a clue rather than a spoiler, the only other possibilities are Irelia and Evelynn: spirit is synonymous with "will" and "vampire" can be translated to "spirit eater", respectively.