Struggling in Chapter 10 of FE9. I'm trying to complete the mission via stealth, because I assume it gives you some sweet bonus items, but it isn't working. Thinking I'll either check a guide or just give up. Ike is still ridiculous, Soren is really good, and Titania seems closer to a Seth than a Marcus. Oscar and Boyd both seem to have potential, but neithe rof them have had great growths to start out. Dunno if I like Mia or Ilyana much at all. No idea if Mist or Rolf are worth it, but I put a few levels into each of them just in case. Also not sure what to make of these cat characters, but Lethe seems to be working out okay so far.
...I miss Fire Emblem. I had great times with the others I've played.
The prize for stealthing Chapter 10 is a shitload of BExp, so if it sounds like its too much of a pain in the ass, you can potentially skip it.
To actually pull off the stealth, you'll need to bench everyone but Ike, Oscar (you must bring Oscar), and either Titania or Marcia. Enemies can only detect you if they are within attacking range of you and the same can go for NPCs you've freed but haven't rescued or recruited yet. Enemies also move at a very clockwork like rate, so its all a matter of timing. And while you can't do anything about the wandering mooks, the boss is fair game (and I'm not too sure about this, but I think his two immediate mooks are also fair game; you'll have to double-check a guide to verify). You can even help yourself to at least one chest in the side area (and I'd definitely recommend checking a guide beforehand on that).
As for where you are right now, characterwise. Rhys is an excellent heal bot and the only one in the game capable of using Light Magic, but Mist has a very important role to play down the line and Light Magic is vendor trash in this game (the tomes are way too heavy and Rhys will always have garbage tier Str), he will have ridiculous Mag and Res and solid Spd (which won't matter if you bother with Light Magic at all). Soren is probably the best Mage in the game (although that's not saying much) since he starts as a Mage, has excellent availability, comes with a free Adept, has good Mag and Spd, and a good support bonus (also there's bullshit in FE10 that involves him getting an A ranked support with Ike in this game; although Ike's also one of only two people he can actually support to begin with, so that's a consideration as well), that said, his Str is garbage and can make or break his early performance and Wind magic is almost as bad as Light Magic (since its piss weak). Mia is ehh, her Str growth is mediocre (and her Def is crap) and she has to contend with the hot garbage that is Female Swordmaster caps, but still she's usable though thanks to free Vantage (provided you feel that she's worth the Forges necessary to compensate for her lackluster Str and if she should be the one to get the Resolve scroll, which doesn't show up until near the end of the game), has the best availability out of all the Swordmasters and is the second easiest to recruit (which will be a thing). Ilyana is kinda mediocre for a Mage (which makes her doubly mediocre) but she does start with Thunder magic (which is the closest to being the best Magic type in the game) though Shade is the worst default skill out of the three prepromote Mages and even though she has good Str growth her Spd is mediocre at best. Marcia has a slow start but can potentially be one of the best units in the game due to being a Pegasus Knight (i.e. Mounted and Flying) and having solid growths all around (if she's lucky). Mist is probably going to be your other healer outside of Rhys and any Mage you have promoted, and while her Mag isn't nearly as good as Rhys's she gets decent Str to compensate, more importantly she gets access to Swords and a Horse upon promotion and she's one of two people who can actually make good use of the Sonic/Rune Swords that show up later in the game, she also has an important mission much later in the game and being promoted for it will help a ton. Rolf is crap, outside of helping out in Chapter 12 and recruiting another guy in Chapter 18 (who really isn't worth the trouble of recruiting), he'll be strictly inferior to your next Bow user and both a pain in the ass and a resource hog to make usable, the only thing he really brings to the table is a Triangle Attack with his brothers (but that requires actually using Rolf and hamstringing Oscar into using Bows instead of Axes). Lethe and Mordecai are Laguz, I wasn't too fond of how Laguz worked for players in this game and these two bring the least to the table, at least Mordecai can Smite which will be useful for a couple of Chapters and Lethe is probably the better Laguz to take into the Desert level for reasons. Volke is awesome, use him regularly and you wont regret it, he's effectively your only Thief in the game and the stealable loot in this game is MAD (Physic staffs for EVERYBODY), just make sure he hits level 20 by Chapter 18 and you'll be golden.
Hopefully this isn't too wall o' text.