Gudako is, for all intents and purposes, a "chibi" version of the female design for Fate/Grand Order's protagonist. She wears the female version of the Mystic Code Chaldea uniform or its Arctic version, has orange eyes that don't seem to reflect light, and has short red hair with a side ponytail and an ahoge. Occasionally, she wears only underwear or nothing at all. Her facial expression is usually a blank, open-mouthed smile.
Gudako exhibits a noticeably erratic and eccentric (if not outright insane) personality characterized by an all-consuming addiction to gambling on gacha. Belligerent, impulsive, and volatile, she often berates, harasses, and abuses the people around her in various ways, particularly her Servants. Gudako seemingly has a love/hate relationship with rolling gacha: while she often demands Saint Quartz in order to facilitate rolls and goes into manic fits of excitement upon learning that she can play the gacha, she also warns other people to stay away from gambling on gacha and cites it as being a hell she can't escape from. Even so, her attitude towards her Servants is incredibly poor. She discards low-rarity Servants as worthless, and treats her high-rarity ones little better, frequently neglecting or assaulting them.
Gudako's motivation for gathering Servants seems to be largely credited to lust. She is seemingly exclusively interested in women, with a particular fondness for Mash Kyrielight and Olga Marie Animusphere. With other people, she tends to alternate between an utterly uncaring, sadistic, and abusive attitude, and an extreme protectiveness and genuine fondness- often doing so for no logical reason.
Gudako is extremely lazy, and has absolutely no regard for her position as a defender of humanity; indeed, she may not even be entirely aware that she's supposed to be defending it at all. It is often noted that, despite her having been active since launch, she makes very little progress in the game's story mode, preferring to focus on farming and events or accumulating quartz and only beginning Part 2 after it seemed Mash would leave her otherwise. For this reason, Chaldea has made active efforts to remove her from power, which almost always fail. She also complains incessantly about the game itself, and is especially vocal when complaining about the inability to skip Noble Phantasm animations.
- Mash Kyrielight and Olga Marie Animusphere: Mash and Olga are the most common victims of Gudako's sexual advances, and are engaged with her in a peculiar love triangle. Despite her interest in both Mash and Olga, Gudako is aware of their own burgeoning relationship and fantasizes about the idea of them cheating behind her back in a way that most observers consider disturbing. She still seems to care for Mash in some strange way however, and in her absence Gudako's behavior becomes even more unhinged than usual.
Gudako, appearing as the Master without a Name, comes from an alternate world to battle her counterpart Ritsuka Fujimaru.
Master Abilities: As a Master of Chaldea, Gudako presumably has all the abilities the canonical protagonist does, such as summoning Servants and using Command Spells.
Physical Prowess: Gudako is a capable physical fighter and is able to deal severe damage to people by attacking them weaponless. She also demonstrates the strength necessary to lift and carry heavy objects, such as Mash's shield. She has enough prowess to easily defeat Servants, having killed Elizabeth Bathory in a single blow to the head at one point. Her resilience is no less impressive, having survived being impaled through the chest by Lancer.
Agelessness: Gudako is thousands of years old, having survived an attempt to get rid of her via rayshifting her to 10,000 BC by simply waiting it out. She credits this to the indomitability of the human spirit.
Servant Creation: Gudako is able to handle the mud of the corrupted Holy Grail with no ill effects. Using it, in combination with udon dough, she can craft "Servant larvae." They take time to grow, but develop into full-fledged (albeit often weak) Servants.
Fourth Wall Awareness: Like most of the characters in Learning With Manga! FGO, Gudako is aware of and capable of breaking the fourth wall. She makes frequent reference to the gameplay mechanics of Fate/Grand Order, particularly the gacha system and the lack of Noble Phantasm animation skip button, and the game itself seems to exist in-universe (Gudako commonly plays it on her phone).