Paul Greyrat

Paul Greyrat was the father of Rudeus Greyrat, Norn Greyrat and Aisha Greyrat who was both a talented man that became advanced in all three sword styles at a young age and a lustful man that attracted and slept with many women, but he eventually marries Zenith.

Following the Teleport Incident and inability to find his family, Paul fell into depression and drowned his sorrows in alcohol until his reunion with Rudeus.

He died protecting Rudeus in Beggarito Continent's Teleportation Labyrinth.
(Source: Mushoku Tensei Wiki)