For the creation of guilds perhaps there could be a choice for the creator/founder of the guilds alignment.  Negatively aligned guilds would have tendency to be more offensive and be associated with aggresiveness and battle.  Perhaps being contracted to kill people or attack other guilds.  
Negatively aligned guilds would have aggresive guards and be very competative.
Positively aligned guilds would be opposite, getting contracted for trade, defence or rescue.  They would be passive and instead of warring with other guilds compete their best members against others in arenas and such like.
They would have more defensive structures, such as archer guards on battlements and a lock down gate preventing entry.

Each alignment would have good and bad points.  The negative alignments would not be so good at defending, but would have strength in attacking.  And vice versa.  

Perhaps when guilds become allies they could have a joint headquarters.  And the strengths of the allies would add up in the structure.  Two positively aligned guilds would have more guards and a larger defensive structure.  Two negatively aligned guilds would get bonuses in attacking.  
A negative with a positive would build a defensive structure with a good attacking force... and so on.
Just an idea.
Criticise all you want

Regards - Salizar