Magda "Tonker" Halter is a minor character in the novel Monstrous Regiment. Her real name, Magda, might be a reference to the Magdalene Laundries, an institution which was at least as bleak as the Girls' Working School. "Tonker" is a dwarven word used in connection with Lancre's decidedly masculine Long Man earthworks and is British slang for a penis. Magda has gone a bit overboard in chosing an alias that sounded very manly. She joined the regiment with Polly Perks as a new recruit, another of the women in the regiment who has dressed as a man to enlist. She is described as being big with red hair, which she wears cut very short. She is one of the last ones in the regiment that Polly identifies as a girl and only after a tip from Maladict. She is another resident of the Girls' Working School in Munz, with Lofty Tewt and Wazzer Goom, where the school's brutal mistreatment of its residents had hardened her into a cynic with a barely-controlled temper and Lofty into an arsonist. Polly's first impression is one of "nervousness that didn't quite conceal some bubbling anger". Tonker describes herself as having "no middle gears". While she is relatively talkative when around her fellow Girl's School residents, Lofty Tewt and Wazzer Goom, she hardly gives any information about her own life, either while at the school or before. She and Lofty are always found close together, leading Polly to believe that Lofty is "his" girl. Tonker also seems to be the only one able to get some sense out of her very quiet friend. The girls escaped from the School when a window in the basement was left unlocked, but Tonker has promised her friend that they would go back in the summer, when the building will burn better. Despite their close friendship, which seems to be rather a dependency, especially on Lofty's side, the latter can frighten even Tonker when she gets her hand on a match. After the treaty, she and Lofty disappeared, but shortly afterwards the Working School burned down and a bank was robbed by two slim hooded figures, an obvious reference to such female figures as Thelma and Louise and an indication that professions such as bank robber are no longer the strict provenance of men.

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