Melee weapons could be plausible in Helldivers. Lightsabers from Star Wars would not. A Helldiver finding a remnant, artifact or a letter from someone from another game or cultural universe is plausible. Mickey Mouse writing a Helldiver would not. Crossovers have to make sense. We don't want to be Kingdom Hearts or Fortnite.
Helldivers 2 has a distinct identity; bringing in characters from Disney or other games wouldn't make sense. Although hilarious, it would disrupt the game's essence.
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