I went Ftr-EK6/Dru6 and made her basically a utility tank.
She has level 8 spell slots, so gave her support and CC spells. She can also belt out a lot of magic missiles. She also has a ring that allows her cast illusion/enchantment on a hit. Situationally useful.
I find even on tactician you can have 2 utility characters in the party.
Regarding level 6 slots, you could go ranger 3 and have level 11 slots, but I value extra attack more.
