Goblin Slayer manga is indeed ongoing. It continues to captivate readers with its unique plot and character arcs. The creators are committed to bringing more exciting content.
One interesting aspect could be the contrast in their fighting styles. The Goblin Slayer is more methodical and strategic when dealing with goblins, using his knowledge of their habits. The Doom Slayer, on the other hand, is a force of pure destruction. In a crossover, perhaps they could learn from each other. The Goblin Slayer could pick up some of the Doom Slayer's more aggressive tactics, while the Doom Slayer might gain some strategic thinking from the Goblin Slayer.
There could be a cultural clash. The Doom Slayer comes from a more futuristic and hellish setting, while the Goblin Slayer is in a medieval - ish fantasy world. Their ways of communicating and understanding the world are different. However, this could also lead to some interesting exchanges. For example, the Goblin Slayer might be fascinated by the Doom Slayer's energy - based weapons, and the Doom Slayer could be intrigued by the magic and alchemy in the Goblin Slayer's world.
The Goblin Slayer would likely first have to adapt to the new technology. He'd be cautious around blasters and lightsabers, but would quickly realize their potential in combat. He might start by observing how others use these weapons and then find ways to incorporate them into his own fighting style. For example, he could attach a blaster to his existing weaponry for ranged attacks. In terms of the setting, he'd have to get used to different planets and their unique environments. He'd probably study the local flora and fauna to see if there are any new threats or resources he can use, just as he does in his own world.
One idea could be a crossover with 'Sword Art Online'. The Goblin Slayer could be transported into the virtual world of SAO where he has to deal with goblin - like mobs in a different gaming environment. He might use his unique skills and no - nonsense attitude to clear floors and quests in the game.