Golden rope is most likely the best one since it has stats like life and critical which works for all ninjas. But other tools like shichiseiken which is attack and critical type will not work well with ninjas that mostly use ninjutsu.

The basic idea is the following:

Sword: full unbalancent towards pure damage.

Gourd: full unbalancent towards pure endurance.

Fan: healers tool

Rope: pvp generic averagly spreaded tool

The problem is that considering the long term gameplay only two tools do not fail in their goal and are ropes and gourds.

I really thought fan is the best one for shisui. Which tools would you recommend for the lineup in mentioned?

the problem of fan is that doesn't really matter much those 800 ninjutsu you gain when your stat is over 18k, but matters a lot the difference between owning 1500 more injury and not owning it with a very high stacked move 1 that more or less always crit on enemy move 2-3-4.

even for a healer like azure fang 800 more ninjutsu are just 280 more healings with regenerative healing jutsu (if healing tips is used) and 202 more healings on healing jutsu, both of them are wholly denied by ignition, so is better if your healer just endures better the damage with gourd and maybe increases a bit her chance to not be controlled.

So for shisui just use rope.