Oniisan
If you consider them really close to you then you can call them 'oniichan'
oki inu
Shiwakucha no toshi
ryuu
You can get Japanese coins if you travel to Japan, or if you visit a currency exchange, at an international airport or in a big city.
If, when you say big city, you mean honolulu, then it is on the island of Oahu
You may say 'ookii ashi' to refer to a foot that is big. Written: 大きい足
"neko no onesan" which basically means "cat's big sister"
Shinryoku-shi
You may say something along the lines of "Niichan, konnichiwa."
大きな目 (Ōkina me)
in Japanese"kyoufu no daimaou"恐怖の大魔王
紫禁城 Murasaki kinjō