There are a lot of very clearly powerful and intelligent characters in Zack Snyder's Justice League, especially villains like DeSaad and Darkseid, but actual wisdom within the movie really seems to lie in the heroes and their closest allies.
As unstoppable as the villains may seem, this is, after all, a story about heroes and how they overcome evil, and the mentality that they use to achieve this is built more around togetherness, love, and faith than it is brutality, fear, or self-service. With that in mind, these 10 characters stand out as the wisest of the movie.
Aquaman
Though he's still yet to be a king in the chronology of events within the DCEU, Arthur Curry shows a lot of wisdom beneath his cavalier attitude.
Aquaman is the least sure about resurrecting Superman, simply due to the unforeseeable consequences of bringing someone back from the dead, and, judging by the movie's further visions of the so-called Knightmare future, his misgivings are more than fair.
Martian Manhunter
Though Martian Manhunter may not be engaged with the plot of the movie much at all, it's still pretty safe to assume that a being who has gone undetected on Earth for an undisclosed–and presumably very long–period of time is fairly wise in their decision-making.
They've even appeared to reach a position of power and influence within the highest levels of the US military, and have taken more of a watchful and considered approach to potentially world-ending threats. That can be considered both wise and foolish, but they express a change of heart in the movie's final scene.
Alfred
Alfred is another example of a very cautious character in relation to the more headstrong heroes that make up the DCEU's current Justice League roster. For someone who mostly acts as Batman's accomplice in most of his escapades, he expresses a number of misgivings about Bruce Wayne's decisions.
Again, judging by the Knightmare sequences alone, these doubts are more than legitimate though it never manifests as either the naysaying that Aquaman expresses or the bigotry that Batman has in Batman v Superman: Dawn of Justice.
Dr. Silas Stone
Parental relationships have always been a big part of superhero stories in comic books and Snyder's version of the dynamic between Dr. Silas Stone and his son, Victor, is not only one of the undeniable improvements of the cut but forms the real heart of the movie.
Silas Stone has obvious flaws as a character and his use of the Mother Box to turn Victor into a cyborg is something that Victor deeply resents despite it saving his life. Though he's unable to truly express how he feels to his son's face before he sacrifices himself to mark the Mother Box, the recording he leaves for Victor not only teaches his son about his powers but provides an emotional resolution for the entire movie.
Dr. Elinore Stone
Victor Stone's mother, Dr. Elinore Stone, is in the movie for far less time than his father, Silas, and was completely cut from the 2017 version, only being mentioned in hindsight. Nevertheless, her presence is felt very strongly throughout either version of the story, particularly in Zack Snyder's Justice League, where she's played by Karen Bryson.
In her short scenes, she demonstrates just how loving and supportive she is in Victor's life, as opposed to his mostly absent father. She's even seen defending and encouraging Victor when he's in trouble for altering the grades of a fellow student to help them out during a personally difficult time, which could so easily be seen as the wrong thing to do overall but is completely justifiable from a moral perspective, and that kind of wisdom clearly informs some of Victor's most heroic qualities.
Batman
Though the character spends most of Batman v Superman: Dawn of Justice corrupted by hatred, Bruce Wayne does see the error of his ways, and his actions in both versions of Justice League are presented as some kind of penance for these sins.
Whether his faith in Superman turns out to be ultimately for the better or for the worse, it's hard to see how Steppenwolf and Darkseid could have been stopped without the Man of Steel.
Vulko
A trusted adviser of the evil king Orm of Atlantis, but secretly sworn to train and protect the king's half-brother and the true heir to the throne, Arthur Curry, Vulko is one of the wisest characters in the DCEU and, though he technically debuted in 2018's Aquaman, his part was restored in Zack Snyder's Justice League.
He appears in the story to implore Arthur to take a more active role in events going on around him, knowing that Orm will do nothing, and hands him his mother's trident and the Atlantean armor he uses in the movie. He's shown to look at things objectively and his reading of Arthur as a potentially great ruler is shown to be very astute.
Queen Hippolyta
The ruler of Themyscira, and mother of Wonder Woman, Queen Hippolyta acts much like a superpowered Martha Kent. They're as ready to dish out comfort and advice as they are a fearless all-out attack.
Hippolyta is a leader who can see the bigger picture and is a central figure within the story's events from the very beginning, helping to defeat Darkseid in the Age of Heroes and guarding one of the three Mother Boxes until Steppenwolf's arrival on Earth.
Wonder Woman
Wonder Woman contains much of the wisdom of her mother with an added sense of perspective on the wider world, as Hippolyta never leaves Themiscyra. She's not as single-minded as Batman but still stands by her decisions despite setbacks.
Snyder certainly makes sure to clearly show in his version of the movie that Wonder Woman is not a character who can be bossed around by anybody and she's a natural leader who shows both boldly aggressive qualities and far-reaching emotional intelligence.
Victor Stone
With the powers granted to him by his transformation by the Mother Box, Victor Stone goes from a bright and promising young student to someone with powers close to the most godlike beings in the DCEU.
Because of his unusual circumstances, he's a very unsure and conflicted character throughout a lot of the movie but his assertion during the finale of the movie to the Mother Boxes that he is neither alone nor broken shows how wise and self-assured he becomes over the course of the narrative.