Fighters are close range combatants that possess a mix of offensive and defensive capabilities. While they don't have as much utility as a tank or as much damage as an assassin, a fighter's damage will add up over time to make it a major threat. Each fighter has a unique blend of mobility, damage, disruption and durability. Fighter is an intermediate melee heroes, between Tank durability or Assassin damage, hence make fighter serve as multi purpose combatant, such as Semi Tank, Crowd Controller, or Tank and Assassin.
A fighter is a type of role that has a combination of characteristics of a Tank and an Assassin. They can act as a semi-tank and a damage dealer because of their durability and damage. This role is versatile depending on the team lineup. They're sometimes used in soloing a lane or in accompanying an ally. They usually shine during the late game.