Principate
Saint Titanfall
What's the verdict on Donnel?
Overall he's not really worth it unless you want galeforce and amplitude on children. Outside of that he's annoying to get and make useful, plus he makes the easiest part of the game (mid game easier), and he's pretty crap end/max stats unless you really like luck.
He's more than viable in normal and hard (though pretty much any character is), but not worth it on lunatic.