I do Let's Plays. Here's my youtube channel.
Unlike most LPers, I do not comment with my voice. Instead I comment with a goofy, expressive avatar with a variety of emotions.
Some examples from my latest playthrough
Most humor (if any!) comes from my amazingly terrible blunders and my reactions to said blunders. To some, it's probably not as entertaining as a voiced commentary. However, I have a lot of fun with this style and the (few) viewers I have seem to like it as well.
All of my LPs with commentary begin with "Kapus Plays". Sometimes I'll do quick playthroughs of smaller games that aren't really fit for commentary, like puzzle games or fighting games. These do not begin with "Kapus Plays", so it should be easy to distinguish. Some of the super old playthroughs on my channel use youtube commentary instead. They do not begin with "Kapus Plays", either.
Although I greatly enjoy RPGs and play them often, I do not really think they are suitable for text commentary. However, a forum post LP might actually work well for some RPGs, so I have been considering doing one.