The cast of Disney's live-action take on The Little Mermaid is shaping up. The film, directed by Rob Marshall (Mary Poppins Returns), already stars Halle Bailey (Grown-ish) as mermaid princess Ariel under the sea with Melissa McCarthy as evil aunt Ursula. Also among the oceangoing characters are Javier Bardem's kindly but powerful King Triton and Daveed Diggs as singing (we hope) crab, Sebastian. But as of today, Disney has started to flesh out the surface cast, starting with Prince Eric. As Variety reports, relative newcomer Jonah Hauer-King (Little Women, World on Fire) will play the …