Well, in Japan of course, and increasingly in America and other English-speaking countries as well. I'd say probably the Chinese fanbase is third-largest and there's also a fairly large French and Spanish/Mexican/other Spanish-speaking base.
No. The most popular manga is Shonen Jump and that is obviously shonen.
I would not think Manga would be popular in Great Britain because Manga orginated from Japan.
deends on how popular your manga is
Naruto
Yes, and it still is.
One Piece is a very popular manga and anime. In fact it is the best-selling manga series ever.
since I'm in London :P i would say quite popular^^ waterstones has some AWSOME manga to buy!
It's a popular manga/anime
The anime news network saysTop 10 Most Popular (Top 50)#titleratingnb. votes1Death Note (manga)8.9420392Naruto (manga)8.1716423Bleach (manga)8.3414314Fruits Basket (manga)8.7412535Fullmetal Alchemist (manga)8.8211116Love Hina (manga)8.4011287Rurouni Kenshin (manga)8.839758Berserk (manga)9.279139Chobits (manga)8.01103310One Piece (manga)8.59851
My absolute favorite Manga of all time is: Fruits Baskets By Natsuki Tayaka. It is one of the most popular selling shojo Manga.
Manga is not very popular in India. Few people know what it is. But there are still quite a few fans. There are manga available in the graphic novel sections of most book stores published by Del Ray and Tanoshimi.
I believe that depending on were you live they are each more popular respectivly. I happen to enjoy manga more even though i live in the U.S.