A character based on a cactus. He is the only "adult" in the studio puppet segments. He acts as a friendly older brother figure, though he can be a bit irresponsible at times. Being a plant himself, he is very knowledgeable about nature and loves green things and things with thorns. His friends include a prickly pear cactus and a rose. He refers to himself as "Sabo-san" and often ends his sentences with casual masculine particles like "daze" or "daro." When pressured by Kossy or Sui-chan, or when he's at a loss for an answer, the bud on his head blooms, and he transforms into "Saboko"—a slightly sadistic, flamboyant "onee" character whose catchphrase is "I'm gonna get all Sabo-Sabo on you~♡" as she playfully attacks the two. However, Sabo-san and Saboko are treated as separate personalities. For example, when appearing on "NHK Asobiba Manabiba," when announcer Naoko Suzuki asked, "Is Saboko-san a friend of Sabo-san?" he replied, "Saboko is a huge fan of Sabo-san." When given water, he grows silky, medium-length hair. When something very sad happens, he freezes with his eyes and mouth shut, gradually grows more thorns, and turns into a real cactus. Being a cactus, he is strong against heat and drought but weak against the cold. He has friends who look very similar to him, such as "Dr. Sabonomizu." He lives with Kossy and Sui-chan. While he is their friend, he is also depicted as their guardian who handles all the housework. He is a singer (likely a singer-songwriter, as he is shown composing). In the program, he performs songs accompanied by his own violin playing and hosts a segment introducing nature. When he's overwhelmed with work, he often gets help from Ofuroski. His voice and puppetry are handled by Mitsuru Sato, who has revealed that he incorporates ad-libs. Sometimes (especially as Saboko), he drops old references that children wouldn't understand (like responding to the word "Nagi" with "Nagi no Balcony, right!" or approaching a character played by Masayoshi Yamazaki by singing "I'm always searching for you!"). As the only full-body suit character in the show, he frequently appears on other programs. In "Minna Atsumare! Kodomo Uta Matsuri" and "Welcome! Yokimaru House," he appears as a regular, even without Kossy or Sui-chan.

A mysterious chair that can talk and move. He has blue legs and a light blue body. The blue part that looks like hair is actually a cover that can be removed or replaced. He has a habit of adding "-ssu" to the end of his sentences (e.g., "Omoshiroi-ssu" for "It's interesting," or "Tantei-ssu" for "I'm a detective"). He always refers to rice as "Rice." He loves rice so much that when eating curry, he saves all the plain rice to eat together at the end. He is happiest when Sui-chan sits on him. While the puppet version has two eyebrows, in the animation ("Kossy of Chair Town"), he only has a left eyebrow. He admires "Sugojiro," a popular manga character in Chair Town. His cousins include Swarin and "Okossy," who speaks in a regional drawl (Kansai dialect). First person: I (soft, polite).

A consistently cheerful girl. First person: Sui or I. She is full of curiosity and loves "finding" things. She is Kossy's good friend and also his rival. In the pilot, she was 4 years old and met Kossy while exploring an attic. The actress playing Sui-chan changes periodically, and her outfit varies by performer. The 1st generation wore beige-based coveralls; the 2nd wore gray and yellow coveralls; the 3rd wore a pink long-sleeved shirt with beige trousers and suspenders; and the 4th wore a shirt with a yellow collar, purple top, and white/pink striped bottom, with a pink and white tie and gray trousers.

The main character of the "Yonda?" (Did you call?) studio segment in the NHK program "Miitsuketa!". First person: I (soft, polite). A mysterious man who responds to the audience with "Did you call? You called, didn't you?" even when no one called him. There is even a legendary episode where he actually realizes the viewers didn't call him. He usually appears while in a bathtub and challenges child viewers with "Can you do this?" The challenges involve crafts or drawing and often have nothing to do with baths, but you shouldn't worry about that. He also appears in the "Yondance" segment that started in 2017. While he mostly appears alone, he sometimes talks with Kossy and Sabo-san in the Sunday edition, "Miitsuketa!-san." He also performs some of the ending theme songs.