Oooh, a Fire Emblem let's play.
Let's see, random comments on the characters introduced so far.
Eirika's the main character, have to use her, stats like any generic lord blah blah blah.
Seth's probably the best of FE's Oifayes statistically but the game's too easy for you to ever really need him. His affinity and support list is absolutely amazing if you do use him, though.
Gilliam's got nice stats, but the game isn't as kind as FE7 in regards to Knights with their gimped movement, mainly because it's a pretty easy game. In FE7, there were a few enemies that posed enough of a threat that Oswin came in ridiculously handy.
Franz is the best of the cavaliers. If you're doing speed runs, he's one of the best characters.
Moulder is better than he looks at first. His secret lies in that he's the only magic user with anything remotely resembling a CON score - he can use things like Elfire without taking any speed loss, which greatly helps with his gimped MAG stat. Or at least gimped in comparison to Lute.
Vanessa is one of the best units in the game, what with that ridiculous speed growth and cross-the-map mobility. Tana technically has slightly better stat growths, but she comes weak late like every Est, so I prefer Vanessa all the way.
Ross is eh, but is probably the best trainee thanks to join time. People like Pirate -> Berserker Ross, but I prefer Colm promoting to Rogue quickly. Besides, it's not like Warrior Ross is a bad option by any means, if you care to raise the trainees.
Did I miss anyone?
Also, you doing Ephraim or Eirika route?