Well, if you're not using em for anything specific or big, their base skills are often good enough already. I think Leif should go unchanged if you're using him in TT. Gray would probably like having some enemy-phase skill with Def refine, so maybe Steady Stance 3 and QR2? Mia should probably just keep her base skills if you're not going Fury + Desperation because she doesn't really want anything else. You can go L&D or something, but that would probably still require Desperation. I could be wrong though, I'm just saying things off the top of my head here.
Abandoned Infantry Swordsmen
I was looking at my units and noticed that some ones are just sleeping in my barrack. A +Atq Leif+1 and Mia+1 and Gray who are neutrals. So I was wondering how to build them ? I've got a ton of infantry swords like Karla, Owain or Alm, and I don't want to do some basic builds like Fury and Desperation for everyone. (Is it because I don't have no more Shanna or Hinata ? Maybe...). I don't have a lot of possibilities for SI and if it possible, want to keep their base weapon.
Leif : I planned of using his base kit (maybe put Fury when I get an Hinata) and why not Quickened Pulse to make of him a Chain Challenge and Tempest Trial monster. With S Drink and QP, is Bonfire better than Moonbow ?
Gray : Why not using him as an anti-cavalry unit ? Something like Zambato Def or Spd refine and Swordbreaker.
Mia : Well, except a Fury / Desperation build, I really don't know. Never pulled for her, she came twice for free (unlike Leif who was a pity breaker).
Sorry if I made mistakes, I'm not a native English speaker.
Hope that you can help me saving those swordsmen from oblivion.
I will definitely keep Leif's base skills, but maybe just change Blazing Light for Bonfire. Also like the idea of a EP Gray, I probably go for Steady Stance, QR and Close Defense SS. Yeah, Fury + Desperation is probably the best to do with Mia, I'm not a big fan of the L&D option, I think her bulk isn't that awful, quite similar to Karla, and don't want to lower it. Thanks for your answer !
Oh, i recently got her 3 days ago. I don't have heroes to give her their abilities, but how you wanna build her depends in what could be your strategy.
For example, in my case, i like building to my heroes on a way that everyone can be able to defeat 1 or 3 enemies, and resist foes attacks.
I don't like the idea of equipping her "Initiative", 'cause she has a more potential that making a last attack before she's fainting.
There's one... Mmm i think it's called "Desperate", if your HP<70%, you can make a consecutive attack.
Yeah, as you can see, Mia's good at Speed. So she can make a double attack, even if she's 1HP she can beat enemies with Desperate. Of course, enemies with 5 points less than her on speed, and enemies that can't resist her attacks.
So as i said, it depends in what strategy you want. I'm gonna equip her Fury, that guarantee a more resistance and HP down near to 70% for activate Desperate. A healer for restore her HP, another with Dance or Sing to give her a extra attack, and last, a hero who attacks enemies resistance.
Hu... Huhu....huhuhu imagine how a Spring Camilla can beat a Lancer Hector, yeah yeah, a Sword effective against Armored units and Desperate uwahahahahaha! My Camillas, all my Camillas are built to be your nightmares. After all, she's the reason of why i started playing a boring game, until this and don't know how much time more.
Yeah, that's all my heroes strategy. Speed. DESPERATE.
*ahem* This I'm using for the Tempest trial.
So, think about what you wann do with her. Good luck :)