This site is a bit different then others. I see no problem with characters rping with each other. You must post for each one individually however. For each character you have, you must also supply a alternate account. The max number of characters is base 3. However you can get rewards to get more. Notice I use however and notice a lot. Anyways, you can get rewards to get more characters. Such as RP Events, 30 Ads and other ways. Lastly if you make a secondary character and your rank is above Captain, your character must be a Solider rank.