Planar Binder?

[Yitzi]

-How would I deal with alignment? My original idea was that the character would choose early on two or three alignments of outsider that they could summon, each of which could not be more than one step away from their own alignment. Binding outsiders of the one's own alignment would most likely be easier to do. However, this seems potentially flawed given the unfair advantage it gives to TN characters, and the question of what is to be done should the character shift alignment.

Say that they get a bonus for each axis on which their alignment matches the outsider's (and they're not neutral), and a penalty for each axis on which it is opposed. So TN will be able to bind anything without penalty, but won't get a bonus on anything either.