It looks like he's been to the fast food(red rooster and chicken treat) for the pineapple.
What part of Perth is he in? There is a lot of Japanese food all over Perth.
For Burritos there is a chain called zambreros which is pretty good. It won't be anywhere as good as the USA though. Mexican food is still quite limited in Perth. I also like the flying taco in North Perth.
Yods Thai Cafe in North Perth does good Thai as does s&t Cafe in Northbridge.
Jus burgers do good burgers as does buttys food van.
There are some good cafes throughout Perth for salads and sandwiches.
I run a blog on cheap lunch spots in Perth. It's called the Pavarotti.
If you could point out what area he is staying in ill try and help with some recommendations close to him.