Kirito is more of a traditional swordsman in terms of his combat style. He often relies on his sword - fighting skills and his ability to quickly analyze his opponents. Yuuki, on the other hand, has a very unique and flashy fighting style. Her movements are more acrobatic.
In my opinion, Kirito and Asuna could potentially win. Kirito has his dual - wielding skills and Asuna is no slouch either. They have fought against powerful bosses in SAO. Naruto is strong, but he might be caught off - guard by their speed and teamwork. Kirito and Asuna have a lot of experience fighting together and could coordinate their attacks well. If they can quickly close the distance and take Naruto out before he can use his more powerful ninjutsu, they could be victorious.
In my opinion, Kirito might have a bit of an edge. He has fought in more diverse situations and has a broader range of combat techniques. However, Eugeo's deep understanding of his own world and its rules gives him a strong base. So, while Kirito may seem more likely to win, Eugeo could definitely surprise him.
Guts is purely fictional. It's a concept or character that exists within the realm of imagination and creative storytelling rather than being based on reality.