Well. You have reached a very important point.
The Demigod is Master of Deception and Disguise and cast subtle spells to cast with impunity.
With +17 deception, actor feat, magical guidance, disguise kit, advantage, Subtle spell, Seeming Spell, Mind Blank.
He can be whoever he wants, when he wants or to convince any creature.
We can say that He is a psychopath.
He heals, summons celestial creatures, greater restoration for belevolent effects.
It is very unlikely that an army will form with many creatures against him.
I can even say, that he can easily govern exercises for his Leadership (Inspire Leadership feat, Who doesn't love it?) and power of destruction.
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As a good psychopath he will take over the world, in force or lie.