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, has orange eyes that don't seem to reflect light, and has short red hair with a side ponytail and an ahoge. Her facial expression is usually a blank, open-mouthed smile.
Gudako exhibits a noticeably erratic and eccentric 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, 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.
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 game itself seems to exist in-universe (Gudako commonly plays it on her phone).