Patamon isn't the only one who has that many Pico Devimon, Mushmon, and Plotmon to name a 'few' of the 850+ Digimon!
Patamon's power is to become a massive Marty Stu and solve the plot whenever necessary, hence Angemon (and his higher forms).
Early in Digimon Adventure, Patamon asks T.K. what a Guardian Angel is. Patamon takes a shine to the idea and decides he wants to be T.K.'s; given the nature of the Digital World and of Digimon, it's not an extraordinary stretch.
The Seven Great Demon Lords. Why only half of the group is named after their counterpart in the seven princes of hell?
For the same reason Valkyriemon, Harpymon and Callismon, male digimon, are named after female figures, the angels appear as winged humanoids and Sakuyamon is a fox miko instead of a mountain goddess?
(Angels appearing as winged humanoids is really common)- Well, it is weird because half of the group is named after their counterpart and the Devas, the Olympian Gods, the Holy Beasts and the Three Great Angels followed a Theme Naming.
Why is Greymon called Greymon? He's not grey. He's orange.
Following the digimon wiki, grey, beyond the color, means old or ancient.
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