Often, they carry a sense of authenticity. If it's about Eric's life, his real - life achievements or struggles would be depicted. Maybe Eric had a particular career path, and the series would show how he navigated through it, with real - life obstacles and successes.
These series may also have an educational aspect. They can teach viewers about a certain time period or a particular aspect of life that Eric was involved in. For example, if Eric was part of a historical event, the series would show the details of that event, the social context, and how Eric contributed or was affected by it. This way, the series not only entertains but also educates the audience.
They are likely to be realistic. Since they are based on true stories, the events and characters should reflect real - life situations. For example, the relationships in the series would be more down - to - earth.