Shizuka should be pretty good because she has fairly good stats to perform as offtank/sweeper (500+ def and sufficient hp post-AW). she should be the only samurai you bother about if you have her.

Anemone is a possible choice for magic fencer since you don't have better alternatives, though she should be low priority since you're probably better off leveling and AWing other units first (looking at saki, belinda, lucile and other maxed but not AW'd units)