In a fanfiction scenario where Naruto saves Ace in the Justice League universe, Naruto might first need to understand the situation. Since Ace is from One Piece and the Justice League is from DC, it's a very wild crossover. Naruto could use his strong sense of justice, which is similar to the Justice League's values. He could communicate with the members of the Justice League, explain his intention to save Ace, and then work together with them. For example, Superman might be impressed by Naruto's determination and help him get to Ace. Naruto could then use his chakra to break any chains or barriers holding Ace.
Well, in a fanfiction, anything can be possible. Naruto's skills like his shadow clones and Rasengan could potentially be used to rescue Ace. Maybe he uses his speed to get through the Justice League's defenses, which are set up around Ace for some reason. And then he uses his clones to create a distraction while he frees Ace with his combat abilities.
In this fanfiction, perhaps Danny Phantom discovers a plot against the Justice League early on. He then uses his invisibility and intangibility to gather information. His ability to fly and super strength (in his ghost form) would be crucial in battles against the villains targeting the League. For example, if the villains had some sort of kryptonite - like weapon against Superman, Danny could use his powers to either disable the weapon or protect Superman until they find a way to neutralize it.
Red Hood might save the Justice League by outsmarting the villains. He could create a diversion or a false lead that the villains follow, while he sneaks in and frees the League. His knowledge of how villains think, from his own past as a villain, would be very useful in this scenario.
The plot could start with Ace being in trouble in the Justice League's world. Maybe he's been captured by an enemy of the League. Naruto somehow gets wind of this and decides to help. He travels to the Justice League's realm and starts his search for Ace. Along the way, he meets some of the Justice League members who are initially skeptical of him but then see his potential. Together, they find Ace and Naruto uses his jutsu to defeat the bad guys and free Ace.
In the fanfiction, Fem Naruto might have some sort of special connection or knowledge. Since Naruto has a strong sense of justice, Fem Naruto would be the same. She might have heard about Ace's situation through some channels and decided to take action. She could use her chakra - enhanced strength to break through any barriers the marines set up to keep Ace captive.
Well, one possibility could be that Naruto's powerful ninjutsu skills give him an edge. He might use his Shadow Clone Jutsu to confuse the Joker and then land a fatal blow with a Rasengan. Another aspect could be Naruto's strong sense of justice which drives him to take out the chaotic Joker in the Justice League universe.
One possible plot could be that Naruto somehow gets transported to the DC universe where the Ace Justice League exists. He could initially be seen as a threat due to his strange powers. But as they get to know him, they realize his good intentions. Naruto could teach the League some of his ninja techniques, like how to use chakra to enhance their physical abilities. And in return, the League could introduce Naruto to advanced technology and different ways of justice in their world.
In a 'naruto vs justice league fanfiction', Naruto might use his shadow clone jutsu to overwhelm the Justice League. His speed and combat skills could give the League a tough time.
One possibility is that Naruto's unique ninja skills would add a new dimension to the Justice League's combat capabilities. His shadow clone jutsu could be used for various strategic purposes, like scouting or creating diversions. His rasengan could also be a powerful offensive weapon against super - villains. Also, Naruto's strong sense of justice and his never - give - up attitude would inspire the other members of the Justice League.
Well, Naruto could show off his amazing ninja skills to the Justice League members. Maybe he'd teach them some cool jutsu like the Shadow Clone Jutsu. And the League could introduce Naruto to their high - tech gadgets and superpowers. For example, Batman could show Naruto his cool Bat - gadgets, and Superman could show his super strength. It'd be a really interesting crossover with a lot of action and adventure.
Well, Naruto's unique ninja skills would add a whole new dimension to the Young Justice League. His ability to create shadow clones could be used for various strategies, like scouting or overwhelming opponents. And his Rasengan could be a powerful attack against the villains they face. Maybe he'd also teach the team some of his ninja philosophies, like never giving up.