|This is what I consider to be one of, if not THE best build for Legendary Azura. This really needs little explanation; we all know what these common skills do, and I'm not going to insult anyone's intelligence by restating what can easily be seen by mousing over the skill name. The only thing that might not be obvious is that when a Dance passive is used alongside Azura's prf weapon, Prayer Wheel, the effect of that Dance skill is applied to every stat, so on this build, using Sing on an ally will grant them +5 to every stat instead of only defense or resistance.
If you don't have access to Guidance as a C passive, you can easily run it as the sacred seal and use Azura's base Atk Tactic in the C slot. If you do this you may want to consider running Torrent Dance in the B slot, which can be inherited from young Azura.
This build can be easily adapted to a flying team (provided you have the resources) by using Flier Guidance in the C slot, or Air Orders if you really want to splurge. Fortify Fliers with Flier Formation as the sacred seal is a good budget option for a flier team.