Below is a quick overview of the 2021 Nitro snowboards lineup.
First I will take a look at any new boards for the 2020-21 season, and any old 2019-20 boards that aren't returning with a 2021 model.
Then I'll look at each board and put them into the categories where I see them best fitting.

New 2021 Nitro Snowboards
The new boards for 2020-21 are:
Exiting 2020 Nitro Snowboards
The 2020 boards that aren't returning with a 2021 model:
All 2021 Nitro Snowboards by Category
I have categorized Nitro's 2020-21 lineup below. This is according to the categories here at SnowboardingProfiles.com and not necessarily the same as how Nitro categorizes them.
Of course these are only broad categories as every board is different, but this is a rough guide.
NITRO BEGINNER SNOWBOARDS
Men's
Women's
NITRO PARK/FREESTYLE SNOWBOARDS
Men's
Women's
NITRO ALL-MOUNTAIN-FREESTYLE SNOWBOARDS
Men's
NITRO AGGRESSIVE ALL-MTN-FREESTYLE SNOWBOARDS
Men's
Women's
NITRO ALL-MOUNTAIN SNOWBOARDS
Men's
Women's
NITRO AGGRESSIVE ALL-MOUNTAIN SNOWBOARDS
Men's
Women's
NITRO FREERIDE SNOWBOARDS
Men's
Women's
NITRO POWDER & SHORT/WIDE SNOWBOARDS
Men's
NITRO SPLIT BOARDS
Men's
Women's
NITRO YOUTH SNOWBOARDS
Summary
So there you have the 2021 Nitro snowboards.
There have been relatively few changes, given the size of Nitro's line. But, apart from the Victoria Pro, which is just a tweaked Victoria (naturally), the other new boards are genuinely new, rather than just being essentially name changes. In fact one of them is a new board with the same name as an old board, essentially.
I was able to test a couple of 2021 Nitro boards, which was nice as I had only tested one previously. For all Snowboarding Profiles' Nitro reviews, check out the link at the button below.