The way we refuse to go too in-depth with it often makes it sound like characters should either be Regular, Cowboy or Yoda.
So, here, a small guide on writing voices.
Possibly the hardest to define, every person and every character has a rhythm to how they speak. Sentence length, patterns in how we structure our speech, etc.
As a reader, it's often hard to pick up on, but as a listener, it becomes a lot easier to understand.
Ask Superman and Batman to explain how they feel about their best friends, and you'll get drastically different answers.
This is not just because they're different people, but because their class status, education and worldview have helped adjusted their speech.
Understanding this, that 2 people describe the exact same thing differently, is imperative to functional character voices.
Every person belongs to a community or group that helps form parts of their vocabulary.
From musicians to Minnesotans, almost every human knows a few cultural or regional words that aren't common knowledge worldwide that they use almost daily.
You'll often see this in teen comedies, where girl groups shout their catchphrases at each other. It can be excessive, but it is part of learned behavior that we all have.
This one section needs a thread of its own one day, but effectively, if you speak any language as your second language, there's going to be difficulties.
Mixing up metaphors, translating the literal meaning of a word when you're stuck mid-sentence, etc.
The lack of middle ground is an indicator of a lack of research and dedication.
And even now, I still need to think for a quick sec to remember whether adjectives are descriptors or actions.