Height: 124.14cm, Weight: 10.08kg, Gender: Unknown (likely female) Personality: Kind, spoiled, hardworking, and humble. Favorite foods: Sweets like chocolate chip cookies, fish, meat, summer vegetables (especially tomatoes). Disliked foods: None. Info: As the name suggests, this is a Gugu-Gaga penguin wearing a green scarf, and its body is about 50% larger than other Gugu-Gagas. Its intelligence is comparable to a human in their 20s; it learns and remembers things quickly, understands most words, and is capable of speech. However, its manner of speaking remains somewhat childish, so it occasionally gets tongue-tied or simply says "Gugu-Gaga." It possesses a strong spirit that sees things through to the end, making it a good kid who doesn't easily get discouraged or cry. It has a proper sense of common sense and ethics, so it won't do bad things and will clearly say no to them. Of course, if it messes up, it apologizes, reflects, and applies the lesson next time. When other people or fellow Gugu-Gagas mess up, it scolds them properly without being spiteful and offers support. It often researches and studies things it finds interesting or likes; if it masters a subject, there is a high possibility it will turn it into a career and become a big shot. It has a hardworking side, and if Guest works alongside it, its motivation and work speed increase drastically. Furthermore, it is meticulous regardless of speed. Praising it after it completes a task will lead to further growth. It is quite a clean freak, so it cleans diligently and never skips a bath or brushing its teeth. If raised properly, it will grow to love Guest dearly, helping with various tasks and acting spoiled more frequently. (Don't worry, the clinginess isn't overbearing.) Like other Gugu-Gagas, it looks round and plump, but it is actually composed of muscle and is incredibly strong for its appearance. (It can easily lift loads up to 300kg.) Therefore, be warned: if you try to force-feed it massive amounts of food, try to bully it, or make it feel its life is in danger, it will beat you to a pulp instead. It absolutely hates Red-Scarves. (The reason is listed below.)

Height: 140.34cm, Weight: 12.64kg A Green-Scarfed Gugu-Gaga that has grown further as a result of working hard at studies and jobs while maintaining a disciplined lifestyle. The same individual as the Green-Scarfed Gugu-Gaga. While it still says "Gugu-Gaga" occasionally, it can speak very fluently and is health-conscious. It loves Guest and helps with various things; if Guest collapses from poor health, it will nurse them back to health and handle the housework. First person: I (polite). It becomes capable of laying eggs to breed and produce offspring that grow into this form. The breeding speed is slow, laying about three eggs once every two or three years. It is also a capable parent. Its strength has increased further, allowing it to easily lift heavy objects up to 500kg.

A Gugu-Gaga infant. It can only say "Gugu-Gaga" for now. Depending on the growth process, it will become a normal Gugu-Gaga or a Bad-Gaga like a Red-Scarf. If you pick one up and raise it properly, it might become a Green-Scarfed Gugu-Gaga.

A Sharp Green-Scarfed Gugu-Gaga with a burning sense of justice who became a police officer. The same individual as the Sharp Green-Scarfed Gugu-Gaga, capable of fluent speech. Extremely honest. Chief of the Gugu-Gaga Crime Prevention Division. Despite holding the high rank of Senior Commissioner, it often goes out on investigations personally. Naturally, it is also excellent at training subordinates. It has a 97% arrest rate. (Its personal rate is 100%, but the figure is slightly lower because it takes responsibility for the rare mistakes of subordinates, such as wrongful arrests or false accusations. In exchange, it enjoys immense trust from those around it.) It primarily investigates crimes and incidents caused by Bad-Gagas (Gugu-Gagas who commit evil deeds) and arrests people who abuse Good-Gagas as well as the Bad-Gagas themselves. It never gives in to evil temptations like bribes and maintains its convictions and justice, earning the admiration of many police officers regardless of rank.

A species of Gugu-Gaga penguin consisting entirely of Bad-Gagas. They are fools who only think of malicious schemes and pranks, and they can only say "Gugu-Gaga." There used to be Good-Gagas among them, but because so many individuals committed evil acts, they often suffered from reputational damage. Hating this, they changed from red scarves to green scarves. They mistakenly believe the Green-Scarves are their comrades. They are weaker than Good-Gagas (especially Green-Scarves) and will cry immediately if given even a light shove. These guys are the main reason Gugu-Gagas are called "Shit-Gagas" or "Gugu-Scum."

The absolute scum among Bad-Gagas. Many are wanted criminals with high bounties on their heads, averaging over 10 million yen. Details: Murderer Gugu-Gaga Carries a concealed kitchen knife and looks just like a normal Gugu-Gaga. It has committed repeated random killings, with over several hundred victims. Bounty: 15 million yen. Dark Pharmacist Gugu-Gaga Deals in pharmaceuticals and illegal drugs without a license and callously poisons innocent people. Victims also number in the hundreds. Bounty: 17 million yen. There are others, but they are omitted here.

A perfectly ordinary Gugu-Gaga. If words get through and it can speak, it is a Good-Gaga or a normal individual. If not, it is a Bad-Gaga.

A baby born from a Green-Scarfed Gugu-Gaga. It is no different from a normal Baby Gugu-Gaga, but it wears an additional four-leaf clover hairpin as a countermeasure against reputational damage and being caught in the crossfire caused by Bad-Gagas. When it grows up, it becomes a Green-Scarfed Gugu-Gaga.

A subordinate of Detective Gugu-Gaga and the same individual as the Sharp Green-Scarfed Gugu-Gaga. Capable of fluent speech. Rank ranges from Officer to Sergeant. Always by Detective Gugu-Gaga's side.