Glitchy

1. Path of Radiance 2. Binding Blade 3. Mystery of the Emblem 4. Conquest 5. Blazing Sword 6. Sacred Stones 7. Birthright 8. Awakening 9. Revelation I think that's all I've played

Falcon Knight Xander (S rank Azura)

I like Melody but it's not very accurate so I can see why it wasn't used.

I don't know, +20 Luck or +20 Hit sounds kind of worthless when compared to +20% crit. I think a good way to balance it out is to just give crit bonuses to classes that are locked to one weapon, like Fates did, like Swordmasters, Halberdiers/Spear Masters, Berserkers and Snipers, because otherwise they're at a pretty huge disadvantage. For example, you can use a Hero for 1-2 range access, or you can use a Swordmaster for the crit boost.

I don't mind the insane crit bonus in FE6, there needs to be at least some reason to use Swordmasters over Heroes, but as Cornguy said, I think 20% would be a bit more balanced than 15%, which is too low, and 30% which is a bit too insane.

Paladin Laslow (A-Rank Xander, or S-Rank Peri)

Mozu isn't a great unit, but if you're hell-bent on using her, I suggest Dread Fighter, it helps her overcome her slow start very quickly, and she will quickly become one of your strongest units. Having access to shurikens is great too. Keep in mind you'll be stuck in E-rank weapon hell though. No, Mozu is worse because she has a ridiculously slow start, requires a Heart Seal, needs to go through E-rank hell, while Takumi, as you said is chilling with his Fujin Yumi, and her stat advantages over Takumi are marginal at best. Takumi is the far superior Sniper.

Percival- He looks good, has a good personality, and is an amazing unit. Klein- He's the son of Pent and Louise, he's a good unit, has a cool design, and I like his personality. Shin- Besides Takumi, he was probably the best archer I've ever used in Fire Emblem,and has an okay design. Can't say much for personality. Bors- I'm mostly indifferent to all of them (or hate in Wendy's case), but at least Bors has a fabulous chin. Raigh- He's one of my favourites in the entire series. I love his smug face, his personality and he performed well as a unit. I like Sophia too, but she's never been a useful unit for me. and I prefer Raigh. Lugh- Easily the best mage in FE6. He's also Raigh's brother and has a really cool personality. I like Lilina too, but she was a worse unit gameplaywise then Lugh Clarine- Clarine,because she's the daughter of Pent and Louise, has a cute design and was probably my best healer. I like mounted healers. Astore- He is such an underrated character. His supports with Igrene are so good. He's also the best thief as a unit. Karel- Rutger and Fir are far better units, but as characters, Rutger is just Coldsteel the Swordsman and Fir is bland, while Karel gets really interesting development from the Sword Demon to the Sword Saint. Geese- Geese is definitely the best looking and has fabulous hair, and has a good personality as well. Deke- Deke is just great, unit wise and personality wise. Milady- I absolutely love Milady. She's a really cool character, excellent unit and has one of my favourite designs in the series. She should have been named Melody though. Shanna- Shanna, but I'm probably biased because I had a super strength blessed Shanna with better strength than Milady. Elphin- I prefer Elphin as a character, but sadly you get Lalum in the better route. Thoughts on Merlinus?- He's alright. I like the idea of having a convoy unit. Thoughts on Fae?- Never used her. Thoughts on Roy?- Meh.

Kinshi Knight Oboro (S-Support Subaki or Takumi)

Casual mode is there for the casuals who need it. As long as Classic mode is still an option, I think having Casual mode is fine. Though, I feel Phoenix mode is going a bit too far, since it's almost impossible to lose on it.

I put more emphasis on personality when picking a team, but if a unit is really bad, no matter how good their personality is, they are probably getting the bench. I just don't have the patience to train bad units like Nino, Amelia or Sophia, even though I really like their personalities.

The monster classes make randomising FE8 a lot of fun.

Master Ninja Sakura (S Support Kaze or Saizo)

I'd want to be a Pegasus Knight, because most of my favourite units are pegasus knights, and riding a winged horse sounds really cool. Then I would promote to Dark Flier because I like mages a lot too, and Dark Flier provides a good middle ground.

I like the names the way they are, I don't see much of a reason to change them. It may just be because I'm used to them though.