Overview

Pros

Nash has the best forward dash in the game and only requires two dashes from full screen to get into close range.
HP Sonic Boom complements his dash well because it travels so slowly, allowing him to trail it.
Moonsault Slash gives him great mobility from a distance and allows him to easily mount an offense from the air.
With Tragedy Assault, he’s the only character who can reduce enemy EX Gauge.
Target combos are particularly useful for knockdown advantage, only sacrificing small amounts of damage when used over link combos.

Cons

Nash’s walk speed is incredibly slow, so you must compensate for this deficiency by making good use of his dash and mobility specials.
With an awful walk speed, his footsies game is non-existent, forcing you to commit to attacks like Jumping Sobat.
Nash does not have an invincible reversal, so his fireball/anti-air game can be tricky to implement against aggressive opponents.
His V-Trigger does not provide a power-up, nor is it a powerful attack on its own, so it can be difficult to use for beginners.

Nash is a balance-type character with tools for most situations. Even though he has a decent projectile, he isn’t a conventional zoning character because of his lack of an invincible anti-air. You’ll have to make proper use of all of his tools to be successful, particularly his mid-range attacks and Sonic Boom traps. Nash is recommended for highly experienced fighting game players who don’t mind a challenge.

Your objective is to establish mid and close range, where his unique attacks, Sonic Booms, and LK/MK Moonsault Slash attacks shine the most. Achieve this by:

Threatening with HP Sonic Boom from range and closing distance with far-reaching dashes
Spotting hesitation points in the opponent’s long-range and mid-range patterns, and getting in with safe Moonsault Slash attacks
Engaging into mid and close range with well-timed Knee Bazookas
Advancing with safe-on-block EX Sonic Booms (with EX Gauge) since they move Nash forward and leave him at advantage