I was watching Prince Charming Dev's (I think he's PC Dev now on Youtube) videos about their recent trip to aulani and there's a number you can call from your guest room to tell you what characters are meeting and when. He called and 'Olu Mel was one of the available characters.
When they visited the gift shop they had 'Olu Mel, Duffy, Shelly Mae, and Gelatoni items.