Queen Michael said:
As far as I know, Nephilim are never actually said to be angels in the Bible. Maybe they're said to be descended from angels and humans, but that means they're not really angels.
Also, note that many of the other creatures that people call "angels" are rarely said to be angels in scripture.
Let's look at the Seraphim and Cherubim as an example. As far as I know, the Bible treats them as their own species, and never says they're a type of angel.
It's worth noting that the term angel comes from ancient words that mean, quite literally, 'messenger.' So it's unsurprising that the Bible would only refer to the 'messenger' class celestial being as an angel. However, the term now a days pretty much means 'celestial being, sans God himself.'
Also, I always found it interesting that it seems only the old Christian churches (Catholics) and the new ones (Mormons), seem to care about angels. I don't think I've ever met a classical protestant who really cared about angels in the context of his or her religion, except for the handful that directly participated in Biblical events (All of which seem human).
anthony87 said:
I don't really know how "accurate" they appear but the angels from Bayonetta are all pretty damn cool looking.
The Bayonetta angels are, mostly, inspired by 'real' angels, with the details polished up to actually look cool (Because a lot of the weirder angels either have lame descriptions or are so bizarre you'd have to be mad or drowning in LSD to comprehend).
Beyond all that, on the subject of angels, one must remember that Christianity used to be a great vampire of ideas. They jacked a lot of stuff from everyone else, and angels are no different.