Angelic ranks. This isn't entirely to scale, angels tend to be abour 4ft~ and archangels tend to be about 10ft~. I also couldn't fit in the serapth for the time angel line, so I'll post them separately when I get around to it.
The life cycle of an angel is pretty simple- they don't die from old age, so they simply live until they are killed. A new angel will not really have any personality or individuality, but they tend to develop this stuff and change their appearances from the default the longer they live and spend time working on earth.
As for archangels, there's 3 per angelic type (1 for each variant in that type, and 216 total). They are mentors and managers for every angel in their subgroup, and tend to stay in heaven MOST of the time as to not do too much damage to the earth with their amplified power. If an archangel falls, an angel from the same variant is selected to take their place (sort of like bee larvae being selected to be fed royal jelly). All archangels are more humanoid to a degree, however none of them have ever looked the same as their appearance changes to match what values and traits they embodied most strongly. Due to this, when you are looking at religious or historical artwork/literature, you can often tell which archangel is or was in power from the way they are described or drawn. But only an angel could actually tell you more, human accounts tend to be very… vague.
Here's the OLD 2021 version of this, just for archival and comparison purposes. Different angel type too of course (drive angel).
