De facto leader of the "Super Peace Busters", a six-person gang of True Companions that tragically dissolved after Menma's death. Once an energetic boy, he has since withdrawn into himself after Menma's and his mother's deaths.
Loners Are Freaks: According to Anaru's friends, he's just a weird shut-in that she shouldn't bother dealing with.
Magnetic Hero: Yukiatsu even grudgingly admits that even now he still has the charm he possessed as a child.
My Girl Is Not a Slut: Defended Anaru from her classmates' slander, even though the two were not even a couple. Though, touching as it was, he didn't pass up the chance to berate her, revealing in the process some of her more embarrassing hobbies.
Never Got to Say Goodbye: He always regretted not being able to apologize to Menma for calling her ugly and confess his feelings for her.
No Social Skills: As a teen, he is very awkward when dealing with people and often can't speak properly with anyone outside his old social circle.
Unable to Cry: For both Menma and his mother. In Episode 8 he, with Menma's help, was finally able to mourn his mother, and in Episode 11 he finally sheds tears for Menma as he and the rest of the True Companions bid their final farewells to her.
A girl who died in an accident five years ago, only to reappear as a ghost only Jintan can see. Despite aging in real-time, she retains her cheerful, childlike disposition, and wears the same white one-piece sundress she wore the day she drowned.
Dissonant Serenity: At the end of Episode 8, the rest of the gang call bullshit on Jintan's claims of being able to see Menma, and Yukiatsu is ready to beat him up when Menma calmly enters, walks over to the table, writes in her diary, and softly drops it once she's done — all the while wearing a smile.
Ghostly Goals: She says she has a wish she wants Jintan to fulfill, but she can't remember what it was. Her wish is actually to help Jintan to cry and show emotions again, which she had promised to Jintan's now-also-dead mother when both were still alive.
Unrequited Tragic Maiden: Played With. She suffers a tragic death right after hearing Jintan deny having a crush on her. In reality, he returned her feelings while she was alive, and still liked her even when she was a ghost.
A girl who idolized Menma, but at the same time was also jealous of her relationship with Jintan, with whom she kept in touch long after Menma's death. Both even attend the same high school, with Anaru often bringing homework to him whenever he's too lazy to go out.
Adorkable: Slowly becomes more obvious over the course of the series. She likes video games and manga, loves stuffed animals, and gets embarrassed easily. It's all but stated that she's been trying to shed this image from childhood, but is still very much the same girl from five years ago.
Expy: Looks helluva lot like Jessica Albert. In fact, the only difference between Naruko and Jessica are their clothes and even many fan-artists loves to depict Naruko dressed exactly like Jessica without too many changes. This is somewhat justified in-universe, as she's a Gamer Chick.
She Cleans Up Nicely: While Anaru isn't unattractive at all, she definitely put more effort than usual into looking nice in Episode 3, letting her hair down and wearing a white dress similar to Menma's.
Toxic Friend Influence: Aki and Haruna belittle Jintan before her and threaten her with ending their friendship to keep her in check, and once got her into serious trouble during trip to a karaoke bar with a couple of older men. Though the ending seems to suggest they're getting better, protectively guarding Anaru from Jintan. It looks like they really are looking out for her best interests.
Unlimited Wardrobe: While all members of the Super Peace Busters sans Menma use this trope, special mention goes to Anaru, who has the most outfits and hairstyles. Also, slightly played with in that she'll mix and match pieces like shirts or boots to create different ensembles.
What Does She See in Him?: Yukiatsu asks her what good she still finds in Jintan, pointing out that he's not the same kid they knew.
Why Can't I Hate You?: Anaru actually feels guilty about being jealous of Menma, since Menma was always very nice to her and a really good friend. She later admits that she feels horrible about having felt relieved when Jintan called Menma ugly.
A handsome, popular student in a prestigious school with Tsuruko. He used to have a crush on Menma, and is resentful of her relationship with Jintan, especially the fact that only he can see her ghost.
The Ace: On one hand he's handsome, extremely booksmart, very popular with girls, seen as very cool...
Broken Ace: On the other he blames himself for Menma's death, resents Jintan and his closeness to her, is unable to interact well with Tsuruko, the only person from the True Companions still close to him, and considered Anaru as his "backup" love interest.
Hypocrite: Accuses Jintan of being obsessed over Menma when he himself is just as obsessed with her but handles it much worse. Arguably lampshaded by Tsuruko who says he's likely projecting himself to Jintan.
Manly Tears: While everyone else has their fair share of tearful moments, special mention goes to the otherwise snarky Yukiatsu, after confessing to his selfish reasons for fulfilling Menma's wish and hearing Poppo's own confession.
A bespectacled, quiet girl who remained close with Yukiatsu long after the gang dissolved, both attending the same prestigious high school. She has had a crush on him for a long time, and is resentful of his fixation on Menma.
Not so Above It All: Looks down on the more immature behavior of her friends, especially Yukiatsu's treatment of Jintan due to his jealousy over Menma. However, she tends to act just as cold and critical towards Anaru, out of her own jealousy.
Only Sane Woman: Looks at things practically when it comes to the gang's antics (a trait that goes back since childhood) and is a definite one in Episode 10 when she is the only one (other than Jintan) who is bothered and openly protests when everyone else puts Jintan on the spotlight and goads him to confess his feelings for Menma.
An awkward child who idolized Jintan for his "coolness" and joined the Super Peace Busters. After Menma's death he began traveling the world, funding it with his part-time jobs, and stays in their old hut when not abroad.
Guilt Complex: Which is why he participates in Anaru's and Yukiatsu's reenactment of the day Menma died.
The Heart: He's often the first to try to defuse a tense situation between his old friends.
Heroic Self-Deprecation/Hidden Depths: Admits to Jintan that he used to act stupid in class just to get noticed, and even when he was befriended by Jintan and the others, all he could do was "nothing but watch."
My Greatest Failure: He saw Menma drowning, but could do nothing but watch her soon-to-be lifeless body slip away. This factors very much into his desire to see Menma's wish fulfilled, or else he thought Menma may not forgive him.
Beware the Nice Ones: She is genuinely caring towards Jintan and Poppo when they visit her house, and implies that she missed seeing them when she remarked that it had been a long time since they last visited. However, she apparently chews Anaru out so much over the false rumors that Anaru decides to run away to the secret base.