Orisa

Primary fire with no damage falloff.

Orisa's primary fire has no damage falloff, so even when hitting distant enemies, it deals the same amount of damage as at close range. This means she can apply poke pressure even against heroes positioned far away, such as Widowmaker or Ashe.

Poke power with Javelin and primary fire

Thanks to the high damage of Orisa's primary fire and Javelin, she can easily gain an HP advantage while keeping her distance. As a result, she gains a strong advantage against dive tanks and rush tanks.

Very high durability with Fortify and Javelin Spin.

Fortify nullifies critical hits from enemies, halves incoming damage, and makes her immune to crowd control, so as long as she is receiving heals from allies, she can temporarily become nearly invincible.

Melt her down with Zenyatta's Discord.

Orisa has almost no mobility and no barrier (unless she takes a barrier via perk), so with Zenyatta's Discord applied to her, Orisa melts down very easily.

Change how you play depending on whether Fortify has been used.

Orisa's durability relies heavily on Fortify, so you need to time your attacks around the Fortify cooldown. When the enemy Orisa uses Fortify, breaking line of sight to reload can make the damage trade against Orisa easier to win.

While Orisa is using Fortify, she can escape from inside Mauga's Cage Fight.