|Alter Ego||Jiro Nezu|
|Occupation|| Phantom Thief|
|Group(s)||Gentlemen Thief Empire|
|First Appearance'||Moving into the Attic (anime)|
|Voice Actor||Hiro Shimono|
Energetic and hot-tempered, the boy is surely almost equal to Nero in terms of activity. His fiery hot-blooded attitude brings out the offensive in the Gentlemen Thief Empire during heists.
In the Holmes Detective Academy under the disguise as Jiro Nezu, a classmate of the Milky Holmes girls. Throughout the anime, he seems cold towards the girls at first blush in school or on the field. But it is shown that he does shows affection to the girls albeit indirectly, particularly Nero who always seems to be at odds with the boy. A running gag of the series, the Milky Holmes girls never seems to be able to remember his name often calling him something else like Rabbit or Rising Thunder.
Rat's Toy is the ability of pyrokinesis allowing him to control fire which he often used to light various explosives which he uses both offensively and defensively.
- Like Twenty, during the first episode of Rat's demonstration of his Toy to the Milky Holmes girls never seems to raise any flags that he might be Rats of The Gentlemen Thief Empire.