User blog comment:IamJakuhoRaikoben/Chapter 484: The Monstrous Six, Review./@comment-100.15.97.117-20160511025440/@comment-5303512-20160511224857

Wow, wow, now you want to talk about Hiro writing her character when you haven't mentioned him once?

I didn't want to talk about how her character brought people down but here goes.

1st, S-Class Exam, It is really Juvia's fault Lisanna came along in the first place.
 * Juvia didn't want to be in the Exams in the first place since she can't be with her beloved Gray.
 * Lisanna wanted to join not because Juvia sounded and looked like her Edo-self but she wanted to be both her friend and get to knew the other Juvia as well and help her become S-Class wizard.
 * Juvia didn't have a strong constitution to turn down Lisanna's offer even when she was having one of those delusional rants about her trying to steal her Gray from her.
 * well not Juvia's fault but when they encountered Erza who is known for never holding back and giving it her all, it was inevitable that they lost no matter who the partner was.

2nd Tenrou Island Attack, well, I will be fair and say that what happened was understandable, however in an alternate setting, if Mirajane was at full power, she could have beaten Azuma and saved Lisanna way before the bomb went off.

3nd First encounter with Sayla, it was really en unavoidable situation with or without Lisanna because of Sayla's macro curse. And as for Lisanna not transforming into smaller animals here are two things:
 * Magic takes great mental concentration to perform, and while being choked hardly anyone can do so.
 * even if she miraculously transformed, she would still be in the clutches of her controlled brother, for if all she was doing was changing form then it wouldn't have mattered since she would just remain in the same space that she was before which is equivalent to her brother having his hand on her throat straggling her.
 * conclusion, it was neither of their faults, it was unavoidable.

4th (Oh Your Going to Love this One!) While Lisanna could do more to help than watch as her sister was fighting Sayla, she probably knew that she wouldn't be able to do much against her and let her handle this. (And you are complaining that she shouldn't be involved in fighting at all!?!)

Besides that, she would have her hands tide with Lamy, but then Sayla managed to blitz and beat down Mira without anything hinting of being Lisanna's fault. While Mira, Lisanna and Lamy were badly hurt, the sisters assumed (which is a common mistake almost every hero makes in every shounen manga) that Lamy was down while the battle continued before Lamy surprised Lisanna and pinned her down, was that Lisanna's fault, no it just shows that Lamy has higher durability. (Admit it, you thought that Lamy was down after that huge eye blast attack.)

Now with the massed produced Lamys, she and Elfman, and those other FT guys were fighting them and she was not holding everyone down and yet they managed to beat the Lamys.

5th Lisanna after the time skip didn't hold anyone back when they were fighting those Alvarez soldiers and then those Weakness robots which they all managed to beat after switching.

See that? In a discussion about Lisanna's character, it is pretty much everything about her in those critical moments.