Inspired by @coe-olivier 's Asterix ocs, I drew my oc Thomas Schneider in the same setting.
Born in Germania under the name Melancholic, then sold to Rome as a slave when he was a child. His master was a patient and sympathetic person, and encouraged him to read in various languages, to work as a translator and interpreter. Melancholic changed his name to Dolorus in order to assimilate better into Roman society. He is rather frail and sickly, shy and anxious, and an utter wet sock of a man who never gets enough sleep.
Despite that, he is rather gentle, polite and courteous, with an interest in druidic medicine. He hates confrontation and would rather hide than fight, but if under pressure he can use his knowledge of diplomacy to keep the peace.
After his master passed away, he works in the library and archives of Rome, proof-reading texts and ensuring that all is in proper order.