According to TheSmokingGun, it was Ariel.
NOVEMBER 6--A convicted sex offender groped a Disney World cast member dressed as Princess Ariel, according to police who arrested the man on a battery charge. Investigators say Brian Sherman, 51, anthesmokinggun.com
Sherman was convicted in 1991 on four felonies related to the sexual abuse of victims under the age of 12. Sherman was sentenced to a two-year “house arrest program” for sex offenders and placed on probation for 15 years. While his probation supervision was terminated in late-2006, Sherman is still subject to registration as a sex offender.
Jesus Christ. They should never stop monitoring these people. They always re-offend.