Merlin

Merlin is a very calm and passive woman almost never losing her cool regardless of the situation. Even as she and everyone were overwhelmed by Galand, Merlin remained calm and was able to think of a strategy to counter him. The only time she loses her calmness is when the situation is beyond her ability to cope such as Meliodas reverting to his previous self or when Arthur was impaled by his own sword.

Merlin is described as a very mysterious woman as many who know her have a difficult time telling what she is after. She expressed excitement when the Ten Commandments were free, primarily knowing she could gain a large amount of information from their appearance and taking an interest in Escanor's powers due to the many mysteries surrounding him. According to Meliodas, Merlin tends to take an interest in anything that is considered "rare" such as Escanor's powers and various Demons she can use for her experiments. Even Demons have a hard time understanding what she's after.

Despite her mysterious nature, according to Escanor, Merlin is a very kind and cheerful woman. She is normally kind and polite to everyone around her, even those she does not know. Merlin is also the only person who treats Escanor as a person rather than a monster as everyone else does prior to him joining the Sins. She also has a motherly side, treating Arthur as a mother would a son and was deeply saddened over his death.

Despite her usually kind and calm behaviour, Merlin knows when to be serious. As when regarding the revival of the Commandments, she scolded Hawk for taking the situation lightly. She also took command after Arthur was killed refusing to let anyone else she cares for to die.

Merlin loves knowledge above all else. Because of her desire to learn everything, she suspended her own age to have all the time in the world to study and learn everything. For that reason, she regularly takes excitement whenever she has the potential to learn anything she does not know about. She was interested in Escanor primarily due to his unique powers as well as how it fluctuates during the day and studies a captured Grayroad to learn more about how his Commandment works. Because of her desire for knowledge, Merlin is a very shrewd and intelligent woman able to calmly assess the situation at hand no matter how dire it is as well as explain the mechanics of any form of creature or magic by heart. However, Merlin is not above acknowledging when she does not know something or when a situation is beyond her capability to understand.

Despite Merlin being usually calm and serious, she is capable of being shocked or embarrassed. When Elizabeth regained her memories she asked Merlin if she could call her "Big Sis-Sis" like she used to which left Merlin deeply embarrassed. She even was embarrassed when the other Sins (mainly Escanor) asked if Elizabeth could talk about it more.

She appears to have very little modesty, as Merlin has no problems wearing very little in public or even allowing Escanor to give her a massage while she was taking a bath.

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