There are three Shinobi builds that are meta in kTOS at the moment, from what Iāve read.
What they all have in common is Hop2 for Spear Lunge (pierce damage) and Finestra (crit rate). Since Kunai is pierce, and is the most powerful burst damage skill Swordsmen have, they build around maximizing Kunai burst.
Full Burst Shinobi
S3 -> Hop2 -> Dop1 -> Shinobi
Since clones use your Soldier skills, you need Double Slash for them to do the most damage they can. Hoplite 2 is for Spear Lunge and Finestra as mentioned before. Doppel is for Deeds of Valor to stack with Spear Lunge.
You really need a Chronomancer since outside of Kunai and Shadow Clone burst, your damage is pretty bad.
Off-Tank Shinobi
S1 -> P1 -> Hop3 -> Dop 1 -> Shinobi
Pretty much the same as the first build, but you get P1 instead of S3, and that forces you to go Hop3.
Your shadow clones donāt hit as hard, but you still have Spear Lunge + DoV + Kunai burst.
Corsair Shinobi
S1 -> P1 -> Hop2 -> C2 -> Shinobi
DWA assault for sustained auto attack damage after your Kunai burst. Your Kunai burst is weaker without Deeds of Valor and your Shadow Clones weaker without Double Slash, but you arenāt reliant on a Chronomancer to reduce cooldowns to sustain damage over time.