Overtuned heroes, look to first pick or ban.

High impact, low variance hero choices.

Slightly more situational than tier A heroes, but can still be impactful with/against the right compositions.

Niche heroes, should typically only be picked in order to counter the enemy team or play to map/team-specific goals.

Heroes which almost always have a better counterpart. It's possible to win with these heroes, but its significantly harder.