This article demonstrates how nicknames that are used by participants in a German forum on eating disorders can be read as identity displays and how they may be related to eating disorders. A qualitative analysis of 83 nicknames of the Hungrig-Online forum reveals that denotational and stereotypical features, along with well-known referents of the names, interdependently characterize participants. Persona attributes such as smallness, weightlessness, childishness, negative self-evaluation, and depression, but also (arguably) self-confidence, are shown to be apparent in the nicknames; many of these attributes can be linked to multifaceted femininity. These findings are then related to general characteristics of eating disorders. In concluding, the far-reaching rules for registration of nicknames in the forum are taken into account and questioned, for it may be that in sensitive online groups, nicknames play an especially important role in identity construction.