Below is a quick overview of the 2021 Never Summer snowboards lineup.
First I will look at new boards for the 2020-21 season, and then the 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 fitting best.

New 2021 Never Summer Snowboards
The new boards for 2020-21 are:
Exiting 2020 Never Summer Snowboards
The 2020 boards that aren't returning with a 2021 model:
All 2021 Never Summer Snowboards by Category
I have categorized Never Summer's 2020-21 collection below. This is according to the categories here at SnowboardingProfiles.com and not necessarily the same as how Never Summer categorizes them.
Of course these are only broad categories as every board is different, but this is a rough guide.
NEVER SUMMER BEGINNER SNOWBOARDS
Men's
Women's
NEVER SUMMER PARK/FREESTYLE SNOWBOARDS
Men's
Women's
NEVER SUMMER ALL-MOUNTAIN-FREESTYLE SNOWBOARDS
Men's
Women's
NEVER SUMMER AGGRESSIVE ALL-MTN-FREESTYLE SNOWBOARDS
Men's
NEVER SUMMER ALL-MOUNTAIN SNOWBOARDS
Men's
Women's
NEVER SUMMER FREERIDE SNOWBOARDS
Men's
Women's
NEVER SUMMER POWDER & SHORT/WIDE SNOWBOARDS
Men's
Women's
NEVER SUMMER SPLIT BOARDS
Men's
Women's
NEVER SUMMER YOUTH SNOWBOARDS
Summary
So there you have the 2021 Never Summer snowboards.
6 new boards in and 6 boards out. The Proto Ultra is a stand alone board, whilst the Harpoon, a mix of the outgoing Maverix and Instagator, replaces both of them at once.
The other changes come in the Proto series, with the Slinger, Synthesis, Women's Syntheis and Mini Synthesis replacing the Funslinger, Proto Type Two, Women's Proto Type Two and Mini Proto. Not just name changes though, there are other changes - mostly the re-jigged camber profile. For more details on the changes, see the "New 2021 Never Summer Snowboards" section at the top of this post.
I was able to test a good few 2021 Never Summer boards (including the new Proto Synthesis, Proto Slinger and Harpoon) and I'll release my reviews for those throughout the year. For all Never Summer reviews on Snowboarding Profiles, check out the link below.