Firstly, let's say the titan event has finished. Now I have Mikage and 6 mythical books. Would you say anything other than first form A3 is bookworthy?
Secondly, I can't get Ninja so what would you say is the best Shadowkin to pair with her?
Her A2 is really strong as well but its up to you if the extra 20% res ignore is worth the books.
As for who to pair her with it depends on your options. Theres quite a few good shadowkin damage dealers. Toshiro / Harima / Genzin are some fairly common options. But also dont feel like you absolutely have to pair someone with her. Shes very good in her own right.
If you don't have the Legos, don't forget about Genbo. He is awesome in his own right, and she gives him the Inc Atk he needs to really shine.
As for books, it really depends on how you plan to use her. Her Alt Form A2 is spectacular.
Unless you have other Mythicals, I'd say book her all the way when you can.
