And if you wanna be serious about using a sword locked unit, if you want a Swordmaster, Joshua is the best choice, you get it in either ch10 or end of 14. If you want an Assassin, you can get Assassin Colm as early as chapter 9/10. Marisa just doesn't have enough going for her statwise, and some people say she's the worst unit in the game, which ngl is absolutely hilarious when Amelia has garbage bases and aside from luck not very good growths.