Alright, considering you hopefully read the summary of this fanfiction, you know what this gonna be all about. However, those up to date on Nat19's Fate Solar/Shadow know that we really haven't explored Suzume's capabilities all too much. We know what her Noble Phantasm is capable of and we know what a few of her skills are capable of, but there's still a lot of unknown things about her. I've done my best to make a few assumptions about her capabilities from the Nat19 wiki and this is what I've come up with. New developments might occur that prove me totally wrong, but I'm going to stick to what I've come up with while writing this story. Apologies in advance to Logan and everybody else if I end up being stupid with their characters.
True Name: Suzume Muramasa
Class: Alter Ego
Parameters:
Strength - B Dexterity - C Constitution - B+
Intelligence - D Wisdom - C+ Charisma - A+
Class Skills:
Item Construction - C - Due to her past as well as Caster's already stated abilities, I'm guessing this is the forging of swords. While this ability certainly works well with Caster and the Dyle clan, the only one in our main party I can see benefiting from this is Ian himself. Lancer and Assassin have Noble Phantasms and have no reason to give those up in exchange for any of Suzume's weaponry. Isla has the Gearblade, and considering it's her personal Mystic Code in honor of Gearfree, she has no reason to exchange that for a different sword. David's already got his own sword that goes with his class, and Diane is very much not a melee fighter. She usually keeps her distance from the fights and sings spells at the enemy.
Should Suzume give Ian a sword, it would give him a viable melee option. Yuno's sword leads us to believe that Caster, and perhaps by extension Suzume, can give the blades supernatural qualities. So a combo of a sword like that with Ian's extracts, like the haste/elemental weapon combo he gave to Lancer, could make him pretty dangerous. I don't think that it would put him on the same level as any of the Dyle clan heads, but he could certainly be more capable at close range.
However, something I'm wondering is whether or not the swords that Suzume would create would be cursed. Considering her grandfather is a very famous cursed sword creator, I wouldn't put it passed her. Especially since in Logan's canon, she was meant to be a surrogate for Sengo Muramasa in the battle between Muramasa and Masamune. So, in my personal fanfiction canon, Suzume's blades will also be cursed swords with the signature Muramasa curse of needing to draw blood before being sheathed. Though it's funny to me that with this addition, both of Ian's weapons can negatively affect him in some way.
Territory Creation - D - In my fanfiction canon, Suzume will not actually create a workshop, she'll create a 'Forge.' My logic for this is since her Territory Creation is at such a low rank, it's main functionality is to give her what materials are needed for her Item Construction skill.
I could totally be wrong about this and Logan might have some other idea for her Territory Creation, but this is what I've decided to go with. So if by some chance you're reading this Logan, I'd like to apologize if I've got this wrong or I'm just misunderstanding the purpose of Territory Creation. I never did fully understand this skill. The Fate wiki basically states it gives the Servant an area where where they're in a more advantageous position, such as gathering mana. But the term workshop leads me to believe that it has something to do with their Item Construction. The few examples of this skill that I've seen demonstrated are Medea and Semiramis' respective uses of this skill, and both of them do wildly different things. So the way I see it, Territory Creation does whatever makes sense for the user.
Personal Skills:
Magecraft - D - We've seen Suzume create a barrier out of blades to fend off an attack from Fafnir. Goro has displayed a similar ability and because their Magecraft rank is the same, I'll just assume they're capable of using this skill for the same things.
Mystic Eyes - B - This ability has also been explained in-game. Goro uses this skill to deflect weaponry, so long as he sees that weaponry as beneath his standards. Because he's considered to be the greatest weaponsmith to ever live, only the realm of gods meets/goes beyond his standards. Suzume shares this ability, and I'm working under the assumption that Suzume's eyes work on the same scale, considering Logan has at least alluded to that in QnAs. Once again, I apologize if I got this very wrong.
Tranquil Heart - C+ - This skill, as explained by Logan himself, allows Suzume to calm those around her. Any mental interference, such as fear or madness, can be instantly dispelled.
Noble Phantasm:
Juuchi Yosamu - C - Anti-Unit - Her sword that she uses in combat. Drawing this blade causes injury to herself, however damage inflicted by this blade is permanent, and will remain with a person no matter what form they take.
Also, a bit of a cautionary warning before you keep reading, this is my first fanfiction. I enjoy writing, but I am in no way saying that I'm a good writer. If you enjoy reading this story, awesome! If you don't, then I can't apologize to you enough.