Ariel - Mavis (Hotel Transylvania)
Prince Eric - Jonathan (Hotel Transylvania)
Flounder - Bambi (Bambi)
Sebastian - Hiccup and Toothless, Astrid and Stormfly (How to train your Dragon)
Scuttle- Beetlejuice and Lydia (Beetlejuice: The animated series)
King Triton - Dracula (Hotel Transylvania)
Ursula - The Horned King ( The Black Cauldron) with Creeper as an extra
Flotsam and Jetsam- Gwythaints (The Black Cauldron)
Max- Bolt (Bolt)
Grimsby - Stoick the Vast (How to train your Dragon)
Carlotta- Mulan's mother (Mulan)
Chef Louie - Thrax (Osmosis Jones)
King Triton Daughters- Toothfairy (Rise of the Guardians), Astrid (How to train your Dragon), Eilonwy (The Black cauldron), Elsa (Frankenweenie), Sally (The Nigthmare Before Chirthmas), Emily (Tim Burton's Corpse Bride).
Ursula as Vanessa - Merida (Brave)
Giant Ursula - Red Death (How to train your Dragon)
Priest - Dalben (The Black Cauldron)
NOTE: In this movie spoof Astrid has one role as a Daugther of Dracula and other one as an Extra with Hiccup and Toothless as Sebastian, this is because she will reunite with Hiccup in Dracula's and Mavis's (Triton and Ariel) conversation about the human world scence.
Also instead of turning into Merida (Vanessa) herself, The Horned King (Ursula) will create her from a skeleton inside the cauldron.