Secondly, create a solid plot. It should be engaging and make sense in the context of both the Blue Beetle universe and the crossover universe. For example, if it's a crossover with the Flash, the plot could involve a villain who can manipulate time and space, forcing Blue Beetle and the Flash to work together. Include some twists and turns to keep the readers hooked.
Another interesting crossover could be with the Green Lantern Corps. The Blue Beetle's alien technology - based powers could interact in fascinating ways with the power rings of the Green Lanterns. For example, they could have to combine their powers to stop an intergalactic threat that is immune to normal Lantern constructs.
Another idea is a time - travel fanfiction. Blue Beetle and Black Beetle could be sent back in time to a crucial moment in their predecessors' lives. They then have to make sure not to disrupt the timeline while also trying to gain some knowledge or power that can help them in their present - day battles. This would allow for exploration of their origins and how they've evolved over time.
It really depends on the circumstances. If the battle takes place in an area where Blue Beetle can make full use of his suit's technology, like in a high - tech cityscape, he might have the upper hand. His suit can provide various offensive and defensive capabilities.