The Characters (Ἠθικοὶ χαρακτῆρες), attributed to Theophrastus, is a collection of character sketches each illustrating some vice, often a vice of excess or deficiency, in line with Aristotle's doctrine of the mean, which suggests that virtue is a middle way between extremes. The work provides a valuable insight into the manners of late classical Athens. It has been suggested that the Characters was an influence on Theophrastus' pupil, the comic playwright Menander.
Free online texts
An Eudaemonist: The Characters of Theophrastus, translated by R.C Jebb (1870). HTML format.
Μικρός Απόπλους: ΧΑΡΑΚΤΗΡΕΣ, Greek text. HTML format.
Perseus: Greek text, edited by H. Diels (Oxford, 1909).
History of Philosophy without any gaps: The Next Generation: the Followers of Plato and Aristotle - podcast by philosopher Peter Adamson.
Simon Fraser University: Theophrastus Project.
Stanford Encyclopedia of Philosophy: Theophrastus, by Katerina Ierodiakonou
The Great Conversation: Further reading at Tom's Learning Notes
Aristotle: Nicomachean Ethics.
Aristotle (attributed): On Virtues and Vices.
Aristotle: The Poetics.
Ancient Greek resources: Learn to read Greek classics in the original.