Bridal Sanaki

(Theory-crafted set made with mass-duel simulator) With this build, Sanaki can one shot Zelgius (Mixed Phase set with Breath skill or Enemy Phase set since as an armor he focuses on using Fighter B-skills in order to achieve doubles as opposed to increasing his speed. He has to sacrifice matchups in order to reach the Speed Benchmark to not be WS'd) and many DC Armors with Luna and otherwise do major damage or defeat armors with triple Goad Fliers and Nifl Frostflowers buff. She functions with Flier Formation units especially well, attacking from two range and allowing a unit to warp next to her to either Reposition her or finish her food off. Also, Swift Sparrow (with +Atk) and LaD work well in place of Death Blow, although Death Blow's availability and one shot potential make this set extremely efficient.

Flyer team based build. Her massive attack stat, which is among the highest of all flyers, only further gets boosted by a Blade Tome.

Fury is used mainly for survivability and to get more procs on Spd Ploy. Death Blow could be used, but doesn't net enough kills. Namely against Triangle Adept users.

Chill Res is the B skill of choice giving Bridesmaid Sanaki an extra 7 damage on the afflicted, you could also run Chill Spd, but this isn't as powerful.

Spd Ploy is the C skill of choice even on a Flyer team, since Spd Ploy isn't a seal yet and can't be used by other support. Flyer Buffs and Goad's can also be used, but Sanaki's Spd needs the extra support.

Attack +3 is the obvious choice for the Sacred Seal to enhance her damage even further.

With the recent introduction of two extremely strong flier buffer(WF Hinoka, Camilla), Bridal Sanaki can be made into one of the strongest CC user. By herself, she already can has 59 atk, and with the help of WFHinoka and Camilla, it can be easily push up to 82 atk (both units with goad flier, exclusive weapon and one drive atk 2 seal, combined with Sanaki's own weapon effect.)
Due to the buffs being mostly invisible buffs, there isn't really much ways to counter it.

The reason to take -Res instead of -DEF or -HP is because you want Sanaki to have more chance to survive one single hit. As long as she survive a hit, she will be able to OHKO most unit in return(with glimmer pretty much all) and activate vantage.

You can also keep her Atk/Res Bond 3 for more firepower instead of the versatility of CC.

This build is very basic, and Sanaki can accomplish much more than this with creative power. However, I'm going to mainly run this build because it's fine for arena and cheap and easy.

Ideally, you want +Atk or +Spd, and -hp or even -res. The -def superbane is problematic for arena bins. This build focuses on bringing her speed up to make her viable for desperation procs and blade explosions. At neutral speed of 30, Speed +3 and Life and Death 3 bring it up to 38, which is average now. Flier buffs will up that to at least 44 with hone, 42 with goad, and 48 with both hone and goad. Although in terms of highest amount of speed, 48 isn't enough, it is enough to outspeed most of the cast in most scenarios including pve content. Only in cases like with speed focused builds or heavy merges and buffs will 48 not be enough (Ayra, among others). Cases like these, however, typically Sanaki should be able to one shot with blade buffs.

Of course, you should alter this build how you like it. For example, Glimmer might feel a better choice for you, but Moonbow will work just as fine. Glimmer might tend to give overkill damage, and Moonbow will stay consistent with higher defense enemies, since lower defense enemies means getting one shot anyway. You can also keep Draw Back, or run a Dual Rally. Personally, on Flier emblem, reposition is very useful since fliers have free roam on the map, and also allows for better positioning for flier buffs.