Ikari Gai

With a bright and always high-tension personality, he seems to be aware of his own restlessness. This personality is said to be due to the family circumstances below.
On the other hand, he is humble in his demeanor, speaking politely not only to other members and Legend Warriors, but even to Navi and junior warriors.

He also has a strong sense of justice, and is quite passionate compared to the relatively calm members of the Gokaigers. While Marvelous and the others fight solely for the "greatest treasure in the universe," Joe alone seriously considers protecting the peace of the entire universe.

In his insistence on being heroic, he even stops Marvelous and the others, who were about to abandon a child who had fallen in front of them, and makes them help the child up (Marvelous, for his part, thought, "If you just tripped, you should get up yourself").
However, the child was annoyed by him and eventually mistook him for a suspicious person.

He calls himself "the man who loves Super Sentai more than anyone else," and his admiration is genuine. However, he doesn't seem to know much about Sentai from before he was born, such as the Chōjū Sentai Liveman.
Nevertheless, he has extensive knowledge of Super Sentai and supports Marvelous and the others, who know nothing about Sentai.

He has a tendency to get a bit too immersed in his imagination, and his ideas led to the creation of the "clean" Gokaigers, Hyuga transforming into Gokai Silver instead of Black Knight, and the combination keys for the Gōon Wings.
It wouldn't be surprising if he could awaken his Imagination or Kiramental.

In the episode guest starring Yousuke, Bomper, and the Engine Souls Speedor & Bear RV from Gōonージャー, he was called "Yoroi-kun."

His favorite food is sweet and sour pork, and he puts pineapple in it.

What's indispensable when talking about him is his Super Sentai fanaticism. In addition to his aforementioned extensive knowledge of Sentai,

Upon his first appearance in the main story, he was extremely excited about the Goseigers' Great Power.
"The Goseigers' Great Power is the Gosei Header, right? Nice! I want to see the others soon..."
When Marvelous and the others transformed into additional warriors, he was again extremely excited, saying "All the additional warriors are here!"
(Not limited to this, he gets very excited every time the Great Power or a Legend Warrior appears.)
He was very disappointed when he couldn't see Yuki Gai.
Knowing Dragon Ranger, Time Fire, and Abare Killer is basic knowledge.
From Navi's vague treasure navigation, he could instantly tell which Sentai she was referring to.
He created his own dictionary, "Super Sentai Encyclopedia," covering all Super Sentai.
He constantly begs the Legend Warriors for autographs.
He actually got an autograph from Bouken Red / Akashi Akashi and was incredibly happy.
He sprinkles lyrics from Super Sentai OPs and catchphrases throughout his speech.

...and so on, the list is endless.

Furthermore, while he always respects the Legend Warriors, he is quite firm in his own opinions.

Even when told by Hyuga to hand over the Gokai Cellular, he insists on his own will to "protect this planet, even for Hyuga-san!"
When the three Hurricangers, who didn't acknowledge Marvelous and the others and demanded the Ranger Keys back, he retorted, "If it weren't for Marvelous-san, the Ranger Keys wouldn't be here right now."
He was the first to challenge Basco when his true identity was revealed.
Despite his broken arm not having healed, he joins Gokai-Oh with the Gōjū Drill.

These actions show a straightforwardness that goes beyond just being a tokusatsu otaku.

Therefore, his main episodes often question "What is a hero?" and "What should a hero be like?"

Incidentally, it is said that he moved around the country frequently due to his parents' circumstances when he was young, and he seems to have many friends in various places.