What was your favorite(s) totally new event 5*?
I narrowed it down to 4.
Solidago, for finally appearing after Convolvulus kept mentioning her over and over again.
Screw Flower, the coolheaded lumberjack FK who needs to deal with the Alice in Wonderland stuff happening around her.
Purple Marshlocks, for the pleasant design, including a weapon that actually fits a wolf girl.
Lilac Squirrel, for her backstory of possibly being the legendary vampire of Banana Ocean and still taking time to play with kids.

What was your favorite(s) totally new gacha 5*?
Since it was 4 last time, I'll stick to it here as well.
Liatris, as she sticks out personality wise - a very intelligent member of Deep Record, having curiosity reckless enough to risk her own life for it (which is not a plot device often used in this game).
Reed, the scarecrow equivallent of our Alice in Wonderland event, for her patchwork design and happy-go-lucky personality.
Winter Daphne, for her trademark jokes of herself being practically a grandma because of her actual age. Those may get stale at some times, but it's still a conspicuous personality trait.
Nodding Anemone, for the amusing backstory of being from a clan of cat trainers, though being inexperiences enough to be constantly chided by her own partner Panso. The cat's design is also pretty recognizable.

What was your favorite(s) totally new 6* (gacha or R-medals shop)?
Threeleaf Arrowhead, for her lethargic personality, speech mannerisms and interesting facial expressions.
Pothos (Scoop) for finally becoming a FK during the events of the battle against Hraesvelgr.
Rye, for a relatively unique backstory of joining the ranks of FKs, while still working at a bakery, to look for a bride for her father who had an alcohol problem. Which also translates into her own dislike of alcohol (kind of reminds me of Diona from Genshin).
Verbascum, for being a timid witch, who tries to gather courage by quoting her favorite action story hero named Captain Planter.

What was your favorite(s) new alternative form? (5* or 6* but all are 6* I guess)
Cepha, for finally appearing again and completing the rerun of the original 4 stars (why as a rainbow though?).
Barrenwort, since I did not expect her to get an alternative form.
Rainbow Rose, for her colorful and very summer-like design (even though the dress should be way less transparent).
Peach, for the devilish design and finally a SD that matches the character. Her original one looks like it belongs to a completely different girl.

What was your favorite(s) new Flower Memory(ies)?
Since I don't pay that much attention to these, I might be mistaken about when they got released.
You have a decent fashion sense - the oufit exchange between Canola and Strawberry
Introductions to love - the one depicting the relationship of Peach and Flowering Peach
Crashing the ball? - the Cinderella inspired one with Dragon Fruit and Daisy, which also reminds me of the 4-koma chapter of it
Surprise ★ Box - which I'm actually seeing for the first time now, depicting the prankster duo of Native Bryony and Twinspur

What was your favorite(s) event?
The Weavers of Abyssal History - Sickle-shaped Solomon's Seal's event - for presenting Liatris's reckless curiosity which I mentioned earlier
Vampire Love Night - Lilac Squirrel's event - since it had interesting girls and an interesting dialogue choice for the Commander...
The Mysterious Wizard of Eda - Screw Flower's event - for the Alice in Wonderland inspired story and distinct characters, even though it was a bit of a pain to read through as it was probably the longest event story to this date
South Cat Isle - Herb-of-grace's event - for the overall presence of the furballs and depicting the difficulty level of herding them

What was your favorite(s) new features added in 2021?
My memory's not good enough to remember which new features we got this year, but I can really agree on the OG 6* rework.
It may have been a response to the power creep, but a welcome one.
Oh, and I guess the rework of the FK ability page as well, making everything way more readable.

What do you wish as new features, changes or everything for 2022?
Same situation as above and once again I can agree that the post-promotion abilities of existing FKs should be reworked along the 6* rework we already got.
Other than that, maybe some sort of new mode where it's not the overall power of a squad that matters, but the specific speed/abilities they have? Something like "one squad needs to shoot down a wall with cannons before another one can cross it". It would require adding a decent planning phase though.
Also, something like a testing grounds dummy with editable buffs/parameters? I guess now we can try to use the mechanical castle in the practice mode for that, but a separate mode for it might be interesting.
Lastly, it would also be great if the game didn't die out under the new leadership of KMS of course.