There is no such thing as "plain English". Every English speaker has an accent mostly based on where they are from, called a regional dialect. I have a Pacific Northwestern American accent (which sounds like a cross between western Californian and Canadian), with hints of northeastern Oklahoman (from my grandma) and unidentified British (a few sounds got stuck when I was 14, after a year of practice for fun in unidentified British). I also pronounce words more "properly" or "clearly" than the typical person in my region, and that's just from flipping through a dictionary when I was a teen, so I guess that's handy.
Character examples: Young and old Sophie from Howl's Moving Castle. Jessie from Pokemon (original Kanto series).
Misc.:
Female and male mallard ducks (quacks and talking). Chicken clucks (various, grew up around animals). Duckling and chicken chick peeps (various whistles through teeth). Very deep voiced man/computer/robot voice (inhaled talking). Lamb, donkey (P.S. They say haw-hee, not hee-haw), male and female turkeys, male American robin, male lion call (long story), ring-necked dove, great-horned owl, young cat (including purring and chattering), and more.