Hiya mate!
I allow alignment plus two others. So your character would have the Law Domain and any other two.
Characters with extreme alignments gain 4 Domains to start; others gain 3 and Neutral deities only gain 2. However, the more extreme the alignment the more limited their choice of worshippers.
After looking over your choices I agree that that was a bad idea on my part since some of those chosen were unsuitable. Its a lot more difficult going over them than say feats; because they are a lot less specifically targeted towards certain classes.
There is a Cosmic Gift called Authority that might very well be the sort of thing you are after; its a lot like a more powerful version of Rulership.
He could combine that with a Divine Gift called Divine [Effect]* and choose the wrath option which would be like a gaze weapon variant of the Divine Blast.
*You get to choose from one of ten different delivery methods (eg. Blast; Breath; Immolation etc.)
Or he could have the Divine Inheritance gift which allows him to borrow the Divine Gifts of others.
Perfect Body gives you the full +5 inherant bonuses for your physical stats (Con/Dex/Str).
Third Eye lets you gaze into your opponents soul and learn their strengths and weaknesses.
Dharma gives you parity with any single ability your opponent possesses.
...I could go on, but I don't like giving things away.
Like I said its very difficult to choose Gifts for any one character because they are far more open-ended than feats. Its not like taking a fighter and you have a very limited choice of feats; I estimate the Divine Gifts are about 75%+ universal.