[quote=@Raineh Daze]
Anyhow, the Einzbern needs a Servant who would've actually stuck around with a strange child for three years, but wouldn't have done such a good job of looking after them that they wouldn't be so socially... off. Which rules out Nursery Rhyme. 
 
[s]Or multiple.[/s] 
[/quote]

Diarmuid is perfect for that then. Super loyal, bad in crowds.