Within the Yamanote line I meant to write. I live in Aoyama 4 chome so have done loads of Nishi Azabu and local restaurants but am curious if anyone has any ideas. The inlaws are 70+ food/wine lovers from NZ and I'm sure they would like something interesting and unique.
Fujimamas just off Omotesando behind kiddyland do good breakfasts and an ok bloody mary. Specialty is eggs benny with a twist on crab cakes not muffins...yum. If you want to avoid kids on Sat/sun go a little late, 12pm+
You may want to try a "Tabehodai" restaurant Essentially this is an all you can eat restaurant but unlike the western version, here in Japan they have a korean style bbq grill at your table which you cook whatever you have chosen from the "buffet". You pay around 1300 yen (US 12 ish) and you have an hour to eat as much as you can. The variety is fabulous, all the fixin's for ramen noodles (you drop them in the boiling water and add your desired miso or different base soups and add spices etc.) There's sliced beef and pork and chicken yakatori that you cook yourself along with veges aplenty!! Obviously rice and salads and desserts, even crumbed fish and chips. Plus you can have hot drinks and fizzy. I am not a fan of buffet dining but this is altogether a different thing. The dinner version of this is more like 2000 yen but still at that price it's a bargain. These places you'll find all over the country, not so much within the yamanote line of Tokyo but on the fringes. They also have a Nomihodai which is all you can drink for a set price... slightly more risky..