Junkhead

I appreciate you coming to me for advice

Kyzas actually surprisingly easy to fix, and theres like 2-3 ways to do so

Do keep in mind, youll want to have him get Spd in his first two level-ups, that way he doubles for all of Part 3. I do this by giving him 99 Exp and Blossom in the very first chapter. I use this trick with most Laguz. Not to mention, it has him doubling as early as 3-4, which he really wants to raise his Strike.

1. Energy Drop + Adept. 

With the Energy Drop, it gets him to the 3HKOing range, meaning Adept makes it a sure kill. Only drawback is the fact Adept apparently doesnt count the last hit for building Strike. Resolve is optional, but it really helps him dodge and proc Adept consistently. 

Hes also pretty tanky, so he can afford to live at half HP and dodge.

2. Just making sure he gets Spd the first two levels.

This way he 2RKOs and gets the benefit of getting Strike, faster. With 3-7 in mind, you can probably get it sometime by 3-8 or start of 3-10 if youve been doing it a lot. I got him over half by the end of 3-7 and more.

Lyre is pretty fucked, truth be told. Youd have to give her like two Energy Drops only to match Kyzas mediocre base Atk, and even then, she starts with the base Spd. Give her every bit of Atk she needs, like supports and stuff.