These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Villain-wise, T-Bag is this, despite only appearing in only one episode. Those who have watched Prison Break know exactly why he's a darkhorse...
Damien's more or less Lloyd's evil twin. His demented behavior and unforgivable actions made him the Big Bad for a season, and he was a pretty good one.
Unfortunate Implications: One of Lloyd's most frustrating quirks is his reliance upon unflattering stereotypes, and his insistence that these stereotypes are accurate. As he puts it, they wouldn't exist in the first place if they weren't true. It's part of what makes him so bad with people, hampering his ability to work with others.