Quote Originally Posted by Anonymouswizard View Post
The Wulfenbach spark is also unusual, in that it seems to bestow an incredibly high resilience to mania. To the point where Klaus seems to be outright immune, but he's also possibly got 'creation of mad science' going for him. It's possible that Gil also has some level of resistance to the spark heirachy, I'd argue out of the three he's probably the least sparky but certainly isn't subservient to Tarvek.
Klaus also made all sorts of mental and physical improvements to Gil when the latter was a child.