Accents & Language
Tips and tricks for giving characters unique voices, plus ways to create your own languages!
Creating Interesting Voices Using Minimal Technique
How to Create thousands of Distinctly Different Voices (Vocabilities / Improve Your Voice)
EASY Voice Acting Techniques for RPG Characters (LunchBreakHeroes)
Player Roleplay with Taliesin Jaffe (Geek & Sundry / GM Tips with Satine Phoenix)
NPC Voices - define a single trait for an NPC that defines their speech patterns