<span class="bbc_u">Iomadae (http://archivesofnethys.com/DeityDisplay.aspx?ItemName=Iomedae)</span>is a good god for a crusading paladin, especially being LG in alignment.  As TheHangedMan notes,<span class="bbc_u">Erastil (http://archivesofnethys.com/DeityDisplay.aspx?ItemName=Erastil)</span>would also a suitable deity, given Aiden's background; Iomadae for crusading types, Erastil for community oriented protectors.<span class="bbc_u">Shelyn (http://archivesofnethys.com/DeityDisplay.aspx?ItemName=Shelyn)</span>could also be suitable, as the goddess has a paladin's code of conduct, as does<span class="bbc_u">Sarenrae (http://archivesofnethys.com/DeityDisplay.aspx?ItemName=Sarenrae)</span>.<br/><br/>As the THM notes, Urgathoa would probably not be suitable since it would require your character to associate with people whom he knows to be evil, and thus putting Aidan's paladinhood at risk by violating his association code of conduct.<br/><br/>An additional note, given as this game is set in a place which will likely have many evil beings (which we may need to associate with), the<span class="bbc_u">Gray Paladin</span>(http://www.d20pfsrd.com/classes/core-classes/paladin/archetypes/paizo-paladin-archetypes/gray-paladin-paladin-archetype/) archetype might help with that.