My current boss has been promoted and we're currently looking for a technical manager to replace him. We (the remaining team) are being given the opportunity to interview the replacement and have a say in whether we hire him/her or not. He/She will be managing a small team in the US and a small offshore team (Java and C#).
What are some good diagnostic questions to ask potential candidates? What are the soft qualities to look for? Are there any Fizz-Buzz-esque questions to ask a candidate about their soft skills / management style etc?