I don't have any experience in official works, as I'm a novice trying to get started. I have worked in a few films made unofficially by younger people on their PC's, which are the roles of the following..
Tales of the Grotto ("Tales of..." fanfilm)
Character played: The Entity
This character has the voice of a young boy, and is the main villain of this story.
Project 001 (2D sprite game)
Character played: Josephina
This character is a rather stuck-up rich girl with a mid-tone voice and a British accent.
Tales of Symphonia (FANFILM; NOT OFFICIAL)
Character played: Kristin Savona
Characters imitated: Mithos; Alicia
Kristin is the main character, and has a loud voice that I often use. My imitations weren't perfect, but I'm proud of my Brianne Siddall impersonation.
Tales of the Apocalypse ("Tales of..." fanfilm)
Character played: Kraya Tamashii
The leading female role. She uses the same voice as Kristin, except a tad softer.
Tales of Symphonia (ANOTHER FANFILM; NOT OFFCIAL)
Character played: Naboros
A supporting character. She uses a deep, rolling voice.
I actually have not had any training. Those around me, and those who have used my voice in their projects say I'm a natural. I do, however, practice both normal speech and song almost every day. (I'm not very good at song yet.)
In addition to vocal work, I do write a bit on the side. I have absolutely no plans of publishing, though. But other than vocal work, I don't have much talent.