Saizo was my first support, for Birthright. It was primarily a stat-based decision. My avatar had a magic boon to create a balanced magic/physical character, and Saizo was one of the few men who would give Kana both strength and magic. Also, I had my secondary class as Malig Knight and I wanted Savage Blow and Poison Strike to stack, plus have Saizo give Kana/my avatar the lethality skill. I thought the S support would be bad, but it was actually pretty moving. One of my favorites of all the ones I've seen.
For my first Conquest run I went ahead and made Jakob S Support with my avatar, because at that point I was appreciating that he was one of the characters that stuck with me no matter what choice I made and I decided to play favorites a little more for the spouse in this run. Since I'd only played with female avatars Jakob was always with me during both birthright and conquest from the beginning. I again had a Magic Boon, and Dwyer was pretty great in that match, better than Kana really.
For my Revelations round, which I'm still in the process of doing, I did a male Avatar so I could marry Azura because that seemed the cannon choice. It is nice to see her actually smile and laugh in the little tree house thing, as she seemed such a tragic character normally. I made my Avatar have Dark Mage/Sorcerer/Dark Knight as secondary class, which also allows Azura and Shigure to get bowbreaker in the Sorcerer line.
