Thrasos

In Greek mythology, Thrasos (Greek Θράσος n.) is the personified concept of boldness.

Although the word θράσος itself could be used both in the positive ("courage") and the negative ("over-boldness, insolence") senses, in the only context where Thrasos appears as a personification (a daemon), it is definitely a malicious being, mentioned together with Hybris and Atë and opposed to Dike.