It's written 坊 /bou/. It's the kanji for 'boy, & priest, as in 坊主 /bou zu/ which means both 'monk' and 'young boy'. As an honorific it's used to show endearment and familiarity towards a...
I noticed the last answer was wrong. The last answer sounded more like the suffix kun. The suffix -chan is for cute or young girls. Maybe a young woman, and barely for a boy (if it is for a boy, it's...