Perhaps he gets a power related to mind control. This would allow him to influence the actions of his enemies or even make them fight among themselves. He could also gain a power that lets him absorb the powers of his defeated foes. So, every time he defeats an enemy, he becomes stronger by adding their powers to his own arsenal.
Samson was a man of great strength. He was a Nazirite, which meant he had certain religious restrictions and was blessed with extraordinary physical power. Delilah was a woman who was bribed by the Philistines. She was used to find out the secret of Samson's strength so that the Philistines could defeat him.
Samson was a powerful Israelite figure. He had superhuman strength and was supposed to be a defender of his people. Delilah, on the other hand, was a woman from the opposing Philistine side. She was used by the Philistines to bring down Samson. She was cunning and managed to coax the secret out of Samson through her wiles.
Obviously, Dipper is the main character as the title implies. His sister Mabel is often included too. She might react in various ways to Dipper getting powers, like being excited or a bit jealous. Wendy is also a common character. She could be a source of support or a love interest for Dipper in some fanfictions.
In this fanfiction, Robin might get powers as a result of a genetic mutation triggered by a rare chemical. These powers could include enhanced speed and the ability to see in the dark. He initially hides his powers from the team because he's afraid of how they'll react. But when a dangerous situation arises where his powers could be the key to victory, he reveals them and they all work together to defeat the enemy and accept his new status.
Well, it could be that Naruto gets some kind of elemental powers from the comet. Maybe the comet is associated with a new, rare element that Naruto can then manipulate. This new power could give him an edge in battles, as his opponents would be unfamiliar with it. He could use it in creative ways, like combining it with his existing jutsu to create even more powerful attacks.
Master Chief could potentially gain the power of super speed in fanfiction. Imagine him being able to zip across battlefields in the blink of an eye, dodging enemy fire and quickly reaching objectives. This would make him an even more formidable force on the battlefield.