empireofchaos
First Post
A katana is traditionally use two-handed I think the longsword would be a better fit than a scimitar. The dual wielding style of the katana and wakizashi wasn't a common fighting style.
But it can be used one-handed with a shorter weapon, whereas a longsword, as a one-and-a half-handed weapon, really, cannot. Your point is equally applicable to a scimitar, which is not a weapon you can generally wield with another (that allowance was made for a certain drow, who is also the reason that a scimitar, which dealt 1d8 damage in most previous editions has now been reduced to a d6). On top of that, the katana, tulwar, scimitar are all still single-edged weapons.
I'd also say that a spy would likely be more of a background with different classes making up the personnel. They would have some skills in common, such as those from the criminal background, it's suggested in the PHB that this background could be a variant for a spy character, but they may each have vastly different abilities. For DnD, some may make up the rogue class, some might be fighters, and I could see a bard as having good infiltration skills but instead of sneaking in they go in through the front door using a false identity.
But in many modern-themed games, the spy is much closer to a class, and much more intertwined with the crunch that dictates what the character can do. It has a professional ethos. People trained in different countries in different techniques - weapons, IT, humint, etc. would have no trouble recognizing their counterparts. My point was that the "spy" character concept, far from marking someone as a unique member of another class, would rather unify them as part of a particular class (the only question is, which one, and would that class be appropriate for a pseudo-medieval setting?).