In Mystery of the Emblem, promotion gains for HP and weapon level consist of giving the character as many points as necessary—the "x" value shown in the table—to reach the promoted class's base value. If the character's value for one of those two stats is higher than their promoted class's base value, they will not receive any bonus in that stat.
Cecil was originally a member of the 9th Platoon, before all of her comrades deserted. Katarina recruits her into the 7th Platoon, and she arrives during a sparring match with Draug/Ogma and provides them with steel-grade weaponry acquired through some of Katarina's contacts.
As with a number of other characters in New Mystery of the Emblem, there is a unique weapon named for Cecil available through Everyone's Conditions: Cecil's Sword.
Cecil is a new recruit in Altea's 7th Platoon, she is shown to be extremely loyal as she's the only member of the 9th Platoon that didn't desert and how she spemt her life as a knight to Altea. She wants to prove herself as a worthy knight, and does not take kindly to people underestimating her for being a woman. This has led her to react badly to some actions, like Roderick standing up to give her a seat during a meeting, or Kris calling her cute for being scared and she also reacts to Luke calling her a violent girl by beating him up.
Even so she's aware of her flaws and apologises to Roderick for her attitude and ask him to help her improve her weaker areas such as cooking and sewing.
She also seems to value trust a lot and is unwilling to forgive Katarina for her betrayal until she proves her loaylty again.
Cecil, Altean knight
She remained within the royal knights to care for the survivors of war. She swore, as a Paladin of Altea, to stay loyal to Altea to the end.
New Mystery of the Emblem: Heroes of Light and Shadow
Cecil - Altean Rose
Cecil devoted the rest of her life as a Paladin of House Altea.
Used in the New Mystery of the Emblemfan translation patch. Probably chosen due to the name "Cecil" being viewed as typically having masculine connotations in the English-speaking world, and as such inappropriate for a female character.