Why Chloe is a custom kensai which does not follow the D&D rules. Short version: It's a reference to one of her favorite books.
>The concept of the Yr'kai kensai is based more on the Renshai tribe from the Mickey Zucker Reichert novels than it is on the D&D kensai class. I could have come up with a fancy name for her class, but the overall concept fit more closely with that of the kensai than it does any other D&D class so that's what I went with. In these novels, if you're unfamiliar with them (which are based on Norse mythology), the Renshai is a master of ALL swords, and is considered to be deadly in any room where a sword is present (because of their great skill in disarming an opponent and nearly instantaneously wielding that weapon.) However, Baldur's Gate's game system is based on 2nd edition D&D rules, and is therefore limiting the weapon choices. Were Chloe to be proficient in all swords, she'd be using far more proficiency slots than the system allows, not to mention she should technically have a higher rating than proficient. So I had to limit it to one or two weapon choices.
>In the Renshai novels, dual wielding weapons well is a rare and highly respected skill, and is ultimately what any of these warrior people aspire to. Chloe, being based on these people, is no different. She sees wielding two weapons simultaneously as the ultimate show of her skill, and the ultimate means of offense. And knowing her character as intimately as I do (since I created her), I know what weapons she would prefer. There is no better slashing weapon than a scimitar that is widely available to the people of the Forgotten Realms world. One could argue that certain exotic weapons would be better, but being forced to choose one or two weapons, Chloe would not pick an exotic weapon, because if she ever lost HER weapon or it was temporarily forced from her, she would want a weapon that she could get her hands on easily.