Quote Originally Posted by gottesurteil View Post
I'm 90% sure I read somewhere - probably a help tooltip or something - that assist abilities only affect ACTIVE party members. So Sub-party is a definite no. --
I think the Eng wiki claims that. But I don't think that's true.

We'll be getting stuff that explicitly states that it helps the entire party, such as "5% more max HP to x element characters." And these will work even from the backrow, I believe.
At the moment, I don't think Nutaku version has a single party-wide passive ability.