Every player in the squad is defined as an attacker, a defender or an all-rounder.
Attackers, as the name suggests, love fast, attacking play. They have very strong topspin and/or smash power stats and usually have attacking Pro Shots available too - like loops or flips.
Defenders prefer to use heavy backspin to slow the game down and frustrate their opponents. They always have chops or chop serves in their abilities.
All-rounders create the most varied gameplay as they are able to successfully attack and defend. They don't always have the power of an attacker or the backspin of a defender but they have more options available to them.