|Shigure can perform a very useful talent not unlike his darkly-clad, axe-wielding mother: the ability to boost all the stats of a teammate of his choosing after refreshing. This is specifically done with Hone Attack available as either a C-slot skill or Sacred Seal, as well as Fresh Bouquet+ for a wide but seasonally-available weapon with an Speed-buffing effect. Additionally, Shigure's native Geyser Dance 2 is chosen as his B-slot passive skill to fortify his teammate's Defense and Resistance after a Sing. Def/Res Link 3 can be considered to achieve higher gains in defenses for a trade-off of a more circumstantial activation effect. If you cannot afford or are not willing to give Shigure the Fresh Bouquet+, any blue tome weapon and Hone Speed (as either the C-slot or the Sacred Seal) will suffice. If you were fortunate enough to give Shigure Fresh Bouquet+, then the Sacred Seal slot is flexible, with Drives and Tactics being top choices.
Altogether, these skills make Shigure an even better team player in addition to Singing, especially for Bladetome users who vastly benefit from huge buffs to all over their stats (and, consequently, +24 or more to their weapon). Units such as Katarina, Tailtiu, Nino, and Olwen are notable examples, though pretty much any teammates outside of Bladetome users can appreciate a catch-all stat boost.
To achieve this set's purpose, only the aforementioned skills (Geyser Dance, Hone Atk, and either Fresh Bouquet+ or Hone Spd) are required; the rest is ultimately fluff and up to the player. Though this set prefers Shigure with a Speed boon, this set is perfectly fine and nonetheless achievable with any IVs as it doesn't particularly focus on tanking or hitting certain opponents hard.
It should be noted that Blárraven+ is a poor choice on this set, as Raven builds require Quick Riposte or Bowbreaker to bypass Shigure's average speed and successfully beat Brave Lyn. Therefore, Shigure's default Dancer's Score+ is a decent choice to fall back on while being easier on your feather count, though other more useful tomes such as Blárserpent+ or Blárowl+ are preferred. Regardless of weapon, Triangle Adept 3 is still a good choice for allowing Shigure to emergency check red units such as all versions of Tharja. Fury 3 offers an all-around stat boost if that caters to your preferences.