they use fire for the same reasons any one else does, be it for heating or cooking or any other use that fire has.
Fire wolf is kaji ookami in Japanese. However, there are many words for fire in Japanese, and I am not certain if kaji is the best word to use in this context. Other words for fire in Japanese are "hi" and "ka".
The Japanese and other people use chopsticks for many of Japanese meals.
Fire is "hi" in Japanese.
Japanese is both singular and plural, though if you're worried about ambiguity, you can simply use "Japanese person" and "Japanese people."
Buildings...
Japanese
Japanese people use chopsticks to eat their food.
Yes. The Japanese islands are part of the ring of fire.
homo erectus were the first to use fire
Yes, Japanese people commonly use toilet paper in their bathrooms for personal hygiene.
"Giniro no honoo" would be "silver fire/flame" in Japanese.
take a matchbox and use a stick to start a fire..............