Warrior

Overview
Warrior is a straightforward bruiser recommended for beginners. It gains extra power when close to enemies and can safely get close thanks to the shield granted by War Cry. Therefore, Warrior doesn't require much setup to be effective as a bruiser.

Due to the flat stat buffs Warrior gets, it's very strong during the early game. On top of that, the shield of War Cry scales with Warrior's level, so if Warrior gets ahead during the early game and invests into War Cry - it can become extremely tanky for a while and snowball further from that. However, if Warrior can't get ahead early, the flat buffs start becoming less and less relevant and Warrior's relevance as a whole starts dropping around mid game.

Like most beginner classes, Warrior isn't picked much in the pro scene. But, at least it's considered medium tier by most. The main reason Warrior isn't picked much is because are bruisers who are stronger during the early game, so there's no good reason to pick Warrior over them.

On top of that, even when the goal isn't to pick Warrior for early game advantage, Knight is considered a superior pick because it brings similar tools to the table while being more well-rounded. Thus, generally, Warrior is only picked when all the better options have been already taken/banned.

In the Novel
During Yuel's first Classmancers match, his classmate, Jim, played Warrior. Jim had no idea how to properly use Warrior, so he charged straight at the enemies without even activating War Cry, thus getting instantly destroyed.