Do the units share exp? doesnt really make sense to rotate units, like pokemon, you just commit to 6 and level them up, rotating anymore wouldn't be beneficial. At least that what im getting from the FE structure.
I'm starting with Blade, however I'm not sure how to deal the permadeath? I lost the Pegasus girl already in level two? How important is losing a character? Should I restart or are there mainly a handful of characters worth investing in/protecting?