He does not move a lot and was mistaken for a statue with the resemblance of a butler. He and Emil don't appear to age.
Sebastian the Butler Quests
In Act II, the butler is a client to two of NieR's Side Quests:
Sebastian the Butler Appearances
- He makes his first appearance after Yonah receives a penpal letter from Emil asking for their help in finding a cure for his eyes. He welcomes NieR into the mansion and asks him to wait there.
- After a combat sequence, it is later found out that the butler himself had sent the letter under Emil's name seeking help for Emil.
- He makes another appearance upon NieR's second visit to Emil's Manor and welcomes NieR and his companions, yet again.