Xander

Marx (マークス) is a playable character in Fire Emblem If. He is the eldest of the Nohr royalty siblings. He is voiced by Katsuyuki Konishi in the Japanese version.

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Marx is the eldest Nohr royalty siblings. Although taciturn, he has an honest personality. For the sake of the kingdom, he follows his father's, the king's, intentions. He cares deeply for his siblings, including his adoptive sibling, the Avatar. He wields a sword wreathed in dark flames.

At the end of Chapter 6, depending on the side the Avatar chooses, a different scene will unfold. Choosing Hoshido will cause Marx to attack the Avatar.

Etymology
Marx is a German surname. Some claim the Jewish German version of the name is an acronym composed of the first two letters of the Hebrew masiach with a Hebrew rendition of the Latin rex (cf. Jewish German surname Katz).