His current problems

-Mystery cooldown is 3 rounds but he doesn't have any reduction tool.

-Chase only serves to sustain current combo.

-Barrier is strong due to 3 element strengthening but also easily replacable.

Aim of my suggestions

-Spammable mystery for P1

-A more useful chase

-Worthy barrier

-More Anbu Itachi synergy

MYSTERY

Chakra cost: 40, First cooldown: 1, Cooldown: 3

+1 --> Nin-Tai type damage + 30% damage increase

+2 --> 2 round unavoidable Chaos

Y --> Nin-Tai type damage + 2 round cooldown

Y+1 --> Hits 10 units

L+1 --> Barrier(4 round cooldown, Chakra cost 20) + Chaos to a random unit every round

L+2 --> Chaos to a random Ninja every round

STANDART

+1 --> 2 round unavoidable Ignition

+2 --> Hits 3 units

Y --> 25% damage increase

Y+1 --> Combo chance decrease + 1 round cooldown reduction

CHASE

+1 --> Low Float + Tag (2x Trigger)

+2 --> Low Float + Tag + Immobile (2x Trigger)

Y --> Low Float + Tag + Immobile + Debuff Immunity Surpression

BARRIER

+1 --> 60% Attack + Ninjutsu

+2 --> 15% max HP gain on their mystery for affected units

L-1 --> For every attack on Shisui, 1 round cooldown reduction to him + 0.5% Initiative reduction to attacker

L-2 --> 1% Initiative reduction

DODGE PASSIVE

+1 --> One dodge per round + 30% lethal damage dodge chance(separated,irreplacable)

+2 --> 50% dodge chance

Y --> One dodge per round + Konoha units dodge first mystery with lethal damage every round (separated, irreplacable, permanent)