I understand that increases from traits from different branches don't stack. But what about increases from traits with the base abilities of a kingdom. In my case: Does the Evasion 1 from the Avian kingdom stack with Evasion 1 from the Agile trait in the mobility branch?
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To answer this specific situation, Evasion grants an Enhancement, not an Increase. Abilities that grant Enhancements stack up to the Maximum Age Bonus, regardless of their Branch.
The only Increase I am aware of that's part of a Domain's starting Traits is Reptilia, which is explicitly called out as becoming part of their starting characteristics and thus is not affected by any Age or Branch limitations.
I don't think it does. You can stack some stuff from your kingdom with traits from a region, if you either pick that region as belonging to your kingdom, or if you use some other traits that lets you pick a trait from a region as if that region belongs to your kingdom.
Kingdom traits don't stack outside their kingdom and chosen region aside from that, afaik.