Thoughts on Lillina

Breaker skills aren't half bad, something like R Tomebreaker or Swordbreaker can help her deal with the faster reds and G Tomebreaker can deal with buffed Nino and Cecilia.

I think poison strike is inefficient in a nuker. You don't want your opposing unit to survive an attack from your lilina wiTh 1 hp. That'd be super annoying. If anything, you want them to die within one hit. Going by that what are the common threats that you want lilina to kill? Colorless? Go rauoraven+. Need her to kill red mages- give her a breaker skill etc etc. It all depends on the build that your team needs.

I think poison strike is inefficient in a nuker. You don't want your opposing unit to survive an attack from your lilina wiTh 1 hp. That'd be super annoying. If anything, you want them to die within one hit. Going by that what are the common threats that you want lilina to kill? Colorless? Go rauoraven+. Need her to kill red mages- give her a breaker skill etc etc. It all depends on the build that your team needs.

It would help to know what her nature is. Neutral/+Atk Lilina is basically F2P Sanaki. Their stats, from Atk, Spd and durability (Lilina trading off 2 or so points of Def over Sanaki and Sanaki with Res). A basic, yet very solid build for them is the Raven tome, Triangle Adept/Fury and Swordbreaker. That way, they cover almost the whole triangle, including neutral units.

TA vs. Fury

I find Fury keeps them from getting doubled as much, as well as it does add a tiny bit of durability to survive one hit from the stronger characters. It's cheaper and easier to come around, but it's also ultimately up to preference (Roy shouldn't be too hard to find with the current rarity swap). If not Swordbreaker, QR is another good option against ranged characters (again, this is assuming they can take a hit).