Simply write fanfiction (or original fiction if you wish to marry a character you created) in which you insert yourself as a character and then write a marriage between your avatar and the character of your choosing. This can be done with any canon couple, even non-fictional ones such as Batman and Superman. However, since this is fanfiction, it's very likely that they will not remain married for long. Marriage in The Avatar Community is similar to marriage in the real world in many ways. You would need to find someone who satisfies the community's definition of "a good match" for your character. Once you have found such a person, you would need to discuss with them how their character would feel about marrying your character and whether or not they are willing to do so. If they agree, you would need to write a wedding ceremony for your characters and have it approved by the person who owns the character it is being performed before. Then, when both parties post their approval on the forums, it can be used as evidence that the marriage is legal under community law. There are several websites where you can find people who write fanfiction featuring your favorite characters. Some examples are: avatarsr.com, fanfiction.net, proboards.com, and verena.com. You can also search for fanfiction featuring your character.