First questoin about Stock is... Does + 35% Atk stack?
Hey if it stack it will very broken.

Another passive is normal.
Debuff, Def, I won't count Atk 20% buff since it's normal buff for rainbow.
I don't have any idea on building debuff team so I really don't know how to use her.
But with my current team I will put her with Nerine and Ōonibasu to boost her Def buff.
Other of her passive is extra.