He is a skilled scrivener with a nervous disposition.
Before the Gate Rune Wars, Tesla had been involved with Mathiu Silverberg doing shady work by creating fake orders and other documents. However, Tesla's nerves weren't quite up to being a criminal, and so he attempted to leave that life behind by assuming the role of a humble merchant, Albert Onyx, and setting up business in Antei. However, when Mathiu needed Tesla's help to create fake orders in order to free Liukan from Soniere Prison, Tir and Viktor managed to see through Tesla's facade and fool him into admitting his identity, and recruiting the reluctant Tesla to the Liberation Army. Tesla remains a reluctant member, often wishing to return home. After the end of the war, President Lepant appoints Tesla as the Secretary General of the Toran Republic.
Tesla was present during the forging of alliance between the New State Army and the Toran Republic. He reported to President Lepant that the capital guards and the border patrol they could deploy are in the total of 5,000 men.