Question: is flayn good fire emblem?
Answer: Flayn has high MAG (55) and mediocre SPD (35). She doesn't get any good spell beside Fortify which is relatively cool. Her best bet is as a healer, but without Physic as /u/EcoleBuissoniere mentionned her utility is very limited. Also trivia: she has the highest RES growth of all playable characters in this game.