Being youself on the forums counts for more, fwiw: "We don't particularly care about how proficient you are at KAG, but rather the the character you bring to the table. Commitment and involvement to the community and game are sought after"
Generally speaking: If there's a format laid out for you, follow it carefully. If there is no format then just try to not come off like a conceited jackass. :p
Exact format for "not coming off like a conceited jackass" may differ depending on what you're applying for, but as an example try briefly introducing yourself followed by succinctly listing the reasons why you're a good choice (including relevant skills, personal attributes, previous experience, etc.).
Visit the Beginner's Box
Introduce yourself, read some of the ins and outs of the community, access to useful links and information.
Comments on Profile Post by fredmay20