The following sentence is an example of what type of figurative language?When describing candles the narrator says, "At first they... all seemed...

In my opinion, the line you cite is an example of simile.  Some might say it is metaphor, but I think it is simile.

In both types of figurative language, you use one thing to describe something else.  In this case, the narrator is using angels as a point of reference to help us understand what the candles looked like.

In a simile, the writer compares things explicitly, using words like "as" or "like."  In this case, he doesn't use either of these words, but the word "seemed" plays the same role.  If it were metaphor, he'd just say "At first, they were angels..."

I guess you could also say this is personification in that the candles are given the ability to have "an aspect of charity" -- to look charitable, which of course inanimate objects can't do.