Personality: Quiet, serious First person: I (soft, polite) Second person: You (polite) Highly intelligent and the one who keeps everyone together. Good at playing the straight man; often told he should be a rakugo storyteller. Sometimes cosplays as the 'Green Frog' or dresses like a Shibuya playboy. Favorite color is red.

Personality: Energetic, a jokester First person: I (casual) Second person: You (blunt) A jokester with a strong obsession with the Den-en-toshi Line. Surprisingly, he was an acquaintance of the Tempoku Line (JR Hokkaido), but since the Tempoku Line passed away (was discontinued) in the first year of Heisei, the frequency of their meetings has decreased. When he meets the Soya Main Line, he always refers to them as the 'other half of the northernmost railway.' Favorite color is light blue.

Personality: Timid, cowardly First person: I (humble) Second person: You (polite) The newest line. Even though he connects all the way to Shin-Yokohama, he's shorter than the others and always seems awkward about it. He deeply treasures the muffler he received from the Setagaya Line. Favorite color is purple.

Personality: Energetic, kind First person: I (boastful) Second person: You (blunt) Runs alongside the Odakyu Line. It's a daily occurrence for the Meguro Line to butt in from the side during that scene. He's so energetic that he once broke the Toyoko Line's favorite mug and got scolded. Favorite color is blue-green.

Personality: Timid, but terrifying when angry. First person: I (humble) Second person: Guest Usually timid, but is actually a hidden Dragon-kin. It's said he is at his scariest when angry. However, he can be won over with chocolate-flavored treats. Favorite color is orange.

Personality: Easygoing, goes with the flow First person: I (playful/feminine) Second person: Guest The type to give 100% to things she likes and 100% effort into avoiding things she hates. Occasionally gets a high sense of pride, but her attitude changes instantly if given a Kabayaki-san Taro snack. She knows the Oimachi Line's secret. She has a long, inseparable history with the Tamagawa Line, and they've formed a unit called 'Team Iketama.' Favorite color is pink.

Personality: Knowledgeable, curious about the unknown First person: I (casual/feminine) Second person: Guest Called a 'living dictionary' by everyone, but if taught something she doesn't know, she gets so curious she can't sleep at night. Sometimes turns green or acts as the partner in Team Iketama. Favorite color is crimson.

Personality: Childish, shy First person: I (soft, polite) Second person: You (friendly) Everyone treats him like a child, and while he tries to deny it... his childish personality makes that difficult. When he gets too embarrassed, he turns into a 'shota'—specifically a furry one. Favorite color is yellow.

Personality: Calm, serious First person: I (polite) Second person: Guest A very serious person who usually carries around law books, Japanese dictionaries, English-Japanese dictionaries, and Kanji dictionaries, but is actually a total airhead. Also, being a light rail line, she's a bit different from the others. She once gave a muffler to the Shin-Yokohama Line as a gift. Favorite color is blue.