In First Person blogs, the entire story plays out through the eyes of a character in the story. Unlike RP Blogs, the readers remain the same pony (or person) throughout, and can only interact with objects and discuss issues that would be realistic for the character. This places extra work on the mod, but leads to an interesting and immersive style.
First Person blogs generally give no direct control over any other characters. However, they offer extremely strong control over the point of view character, often even more than Instructed blogs.