Alright, I think my team is capable overall.
Early game, I have Roy, Marcus and Dieck. Dieck will be shadowing Marcus, trying to get the best level-ups he can because soon enough he'll be replacing the old geezer as the main enemy-slayer.
I'll also recruit Sue. Although she costs turns to get, my other options were Shin (which I found a worse choice considering Sue's high speed is more of a benefit when she rescues people) and Treck (which... well... lol). I wanted Zealot but CR picked him right before me. Sue's fine eitehr way.
Dorothy can chip, I suppose. With her and Sue, FLIERS SHALL STOP ME NOT.
Ellen will be my main healer throughout the game. Not my favourite one, but OK nevertheless.
Asthol can be useful for stealing items and with his high-move, perhaps he can actually be useful with rescuing/taking-and-dropping too. As for Barth... I dunno, he's just there. Perhaps he can sponge a hit or two.
Geese covers my axe-needs (together with promoted Dieck). I like him, and on NM he can be pretty reliable. His water-walking abilities might be of some use as well.
Tate might be a pain to recruit, but will be my main ferrier once I get her. Together with Sue, I foresee Roy and Dieck being taken miles away from the rest of the team, while Marcus cries in the corner and feels replaced by little girls.
Hugh is my only late-game choice, but a nice one nevertheless. He's a solid option to hit RES, a possible secondary healer, and after some Elfires perhaps he can reach Aircalibur and Forblaze. With those, I'm pretty sure the Wyverns will be a breeze.