One common ability is the Sharingan. It's a very powerful ability from the Uchiha clan. Another could be some kind of elemental control like the ability to manipulate lightning better. Sometimes he might absorb the ability to heal quickly, which is quite useful in battles.
When Naruto absorbs Zetsu in the fanfiction, it could impact his mental state as well. Zetsu has been involved in many dark and devious plans. Naruto might have to struggle with the knowledge and influence of those. However, on the positive side, Naruto could use Zetsu's ability to communicate with the plants and gather intelligence from the natural world. This would expand his range of information sources and give him an edge in strategic planning during battles.
Well, it could enhance his jutsu arsenal significantly. Orochimaru has a vast knowledge of various jutsus. Naruto might gain access to Orochimaru's snake - based jutsus like the Hidden Shadow Snake Hands. Also, Orochimaru is very proficient in forbidden jutsus. Naruto could potentially have a better understanding of these dangerous techniques, but he would also have to deal with the darker aspects of Orochimaru's power and the possible corruption it might bring to his own chakra nature.
Well, when Naruto absorbs abilities in fanfiction, it can make him more powerful, of course. This new - found power might make him more confident, or perhaps a bit overconfident at first. He could start to see himself in a new light and might take on more dangerous missions. It also could change how his friends view him, as he's suddenly much stronger than before.
Yes, it could be considered a relatively new concept as the amount and variety of fanfiction has exploded in recent years, and the idea of Naruto 'absorbing' these diverse fan - created ideas is something that has emerged as a result of the growing and evolving fan culture.
One common ability is enhanced magic. This could mean he can perform spells more powerfully or with greater ease. For example, he might be able to cast a Patronus without a wand or make a very complex spell work on the first try.
In some fanfictions, Harry Potter might absorb abilities through magical artifacts. For example, he could find a special amulet that transfers the powers of the previous owners to him when he touches it.
In some fanfictions, when Naruto absorbs the bijuu, he might gain overwhelming power. This could lead to him being able to easily defeat powerful enemies that were previously a threat. For example, he could single - handedly take on the Akatsuki without much difficulty.
One possible consequence could be an immediate power boost. Since Dark Naruto represents the repressed and negative aspects of Naruto, absorbing it might give Naruto access to a new level of strength that was previously locked away. This new power could be both physical and mental, allowing him to face stronger opponents.