I like this name, but unfortunately it's an overused joke in the anime fandom. It's a favorite of otakus, and Mary Sues are often named either this or Sakura.
I really am into Japanese names, even though I am not the least bit Japanese. I personally think that Hikari goes nice with the name Rose. Hikari Rose has a nice ring to it, and seems pretty uncommon.
I absolutely adore this name! I may actually name my daughter this name, although I am Canadian. I may name her Kari instead, since it sounds a lot like Hikari, although doesn't have the same meaning. I also prefer it pronounced hi-Ko-ree even if it is pronounced hee-KOR-ee.