Media Blasters has been revealing some English dub info on its Facebook page recently, including a sneak peek at the dub cast for Rio: Rainbow Gate. The preview originally premiered at Colossalcon 2016, and among the cast featured in the video are Vic Mignogna as Elvis, Amber Lee Connors as Rio, Natalie Hoover as Anya, and Natalie van Sistine as Rosa.
One of the other previously announced cast members was Brittany Lauda as Rina. Here's the production team behind it:
ADR Directing: Amber Lee Connors (Sound Cadence Studios), Brittany Lauda (NJ)
ADR Writing: Amber Lee Connors, Howard Wang, Justin Briner
ADR Engineering (Sound Cadence): Amber Lee Connors, Howard Wang
ADR Engineer (NJ): Justin Ramos
Assistant ADR Director: Howard Wang
Assistant ADR Director (NJ): Matt Shipman
Production Assistant (Sound Cadence): Justin Briner
Media Blasters also rolled out the complete English dub cast for Juden-chan:
There are a bunch of additional voices, too, all listed over at Media Blasters' announcement page.