This may be an odd train of thought, but would it conflict with your idea of how everything is going to be played out if a character is [u]not on good terms[/u] with their guardian? I'm thinking of a "this thing is haunting me" kind of relationship. 

Also, based on this statement:
[quote=@Inkd Bull]
[@BlackPanther] Only people that have a guardian will be able to see other guardians. Otherwise, if they were flying around as a butterfly, a normal person wouldn't suspect anything more than a butterfly. [/quote]
Would it be possible that other "guarded" humans could see a guardian in a non-butterfly form while it's true form is actually different? For example, have the guardian seem like a human being to the other special people while it's actually a yeti monster thing?

Also, are all guardians going to be "allied", or is it possible for conflicts of interest to arise between the different player-controled parties? Maybe even between a guardian and its associated human?