Naruto might create a 'Night - Vision Clone Jutsu'. With Riddick's eyes, he could make clones that also have the enhanced vision. These clones could be sent out at night or in dark areas to gather information or set up an ambush. The clones would have an advantage over normal clones as they could see clearly in the dark, making them more effective in various situations.
He could develop a jutsu like the Water - Rasengan. Combining the power of the Rasengan with water chakra, it would be a spinning ball of water with immense power. Another could be the Water - Clone Barrage, where he creates a large number of water clones that can attack and then merge back into a large water wave to overwhelm the enemy.
With the Sharingan and Byakugan, Naruto could come up with a new jutsu that involves the Sharingan's ability to predict an opponent's moves and the Byakugan's all - seeing vision. He could create a sort of 'preemptive defense jutsu' where he can sense an attack coming from any direction (thanks to the Byakugan) and then use the Sharingan's prediction to not only dodge but also counter - attack in the most effective way. Additionally, he might develop a jutsu that uses the unique chakra patterns seen by the Byakugan to disrupt an enemy's chakra system while using the Sharingan to keep the enemy locked in a genjutsu - like state, preventing them from escaping the chakra disruption.
He could develop enhanced hearing powers. Similar to how some real - world blind people have extremely acute hearing, Naruto could use this to detect enemies from afar. He might also be able to sense the flow of chakra in a more detailed way. For example, he could sense the different types of chakra in a person's body just by being close to them. Another power could be the ability to echolocate, like some animals do. By emitting chakra in a certain way and listening to how it bounces back, he could create a mental map of his surroundings.
Well, if Naruto had Riddick's eyes, his perception abilities would likely be enhanced. Riddick's eyes give him a sort of night - vision and enhanced sight in general. Naruto could use this to his advantage in combat. For example, in his battles at night or in dark places like caves, he would be able to see his opponents clearly while they might struggle to see him. Also, it could potentially give him an edge in detecting hidden enemies or traps, something that would be really useful in his ninja missions.
He could create a jutsu where he uses the Sharingan to analyze the chakra flow in the ground and then uses Mokuton to grow roots that follow that chakra flow to attack enemies underground. Another jutsu could be to use the Sharingan to copy an enemy's fire - based jutsu and then use Mokuton to create a wooden shield that can resist the heat while also shooting out wooden spikes coated with the copied fire chakra.
Naruto could develop a jutsu that allows him to completely blend his chakra with the environment. For example, he could become one with the wind, making himself invisible to the naked eye and then launch surprise attacks. With his perfect chakra control, he can precisely match his chakra frequency with that of the wind around him.
One possible new jutsu could be the 'Force - Nature Manipulation'. Naruto loves nature and is already good at using nature - based chakra. With the force, he could go beyond just using chakra from nature. He could use the force to actually control natural elements like waterfalls, trees, and rocks directly. For example, he could make a whole forest move to his will, trapping his enemies or creating barriers. This would be a very unique and powerful jutsu that combines his ninja skills with the power of the force.
One possible jutsu could be the Lightning Dragon. He could summon a huge dragon made of lightning that could attack his enemies. Another could be the Lightning Clone Jutsu, where his clones are made of lightning and can deliver electric shocks upon contact. He might also develop a Lightning Dome jutsu, creating a dome of lightning around him for protection.
Naruto might be able to develop a new jutsu that combines the Kyuubi's chakra with his wind - style jutsus in a unique way. For instance, he could create a tornado - like jutsu with the raw power of the Kyuubi's chakra at its core. He could also potentially develop a jutsu that uses the Kyuubi's chakra to create illusions that are so powerful they seem real.
Perhaps it was a gift or a curse from some powerful being. For example, a god or a demon could have bestowed this third eye upon Naruto for some purpose, either to help him in his journey or to make his life more difficult with new powers that come with their own challenges.