Guosim

Guosim, standing for Guerilla Union of Shrews in Mossflower, was a protagonist in the book Redwall and a leader of the titular organization, the Guerilla Union of Shrews in Mossflower. She was such a hypocrite, bossy and fearless one minute, she would get struck by phobias the next upon seeing evil such as Asmodeus the adder. Guosim was a shrew and the first one Matthias encountered, and the first shrew chronologically introduced in the series.

Guosim was hostile to Matthias despite his friendliness and his nature as a Redwall mouse, she refused to let him go over her country, despite her colleague Log-a-Log wanting to let Matthias go. Guosim got her colleagues to tell Matthias in a hostile way what they did with intruders. Guosim was a very aggressive shrew yet when Log-a-Log overruled her she was forced to accept Matthias as a friend or a colleague at least.

Guosim told Matthias where to find Captain Snow, only to have him stumble upon Squire Gingivere the wildcat. Matthias found out Guosim and Log-a-Log were friends of Gingivere's, causing him to scold them for sending him there as if for the cat's dinner. Log-a-Log apologized and said Guosim and him forgot about the cat because shrews are clumsy.

Guosim accompanied Matthias to the quarry to look for Asmodeus, and did a very silly move by shouting the ferry call, Log-a-Log, across the river, as if announcing to the countryside that the shrews were there and a living meal. Guosim received Log-a-Log's anger for this. She was later paralyzed with fear when she saw the adder devour Mingo, a shrew, and drag him off. She went to the quarry and ordered the search for the entrance of Asmodeus' home.

Guosim leant against a stone slab and said that they had to search the top of the quarry and then they'd have to do something, but she never got to say what because the slab gave away, causing her to fall hundreds of feet into Asmodeus' dark lair. The snake got her and she was killed immediately. Matthias found her body.