I write fanatasy humour because, as we all know, this is a licence to print money, particularly for Australian authors. Given the limited market for this genre, should I consider chasing local and international agents at the same time?
You should always query as many agents as you want to. Check out agents' submission guidelines to see whether they have a policy about simultaneous submissions, but generally speaking you should query your little heart out. It's a numbers game - the more people you submit to, the more responses you will get, and the faster you'll work out whether your novel is any good or not. Agents in the UK and US would not be surprised to receive a submission from an Australian. Good luck!