Favorite aspect of Letty...
Probably her capacity to change from a slightly rude and asocial yukionna to one that goes to public events and shares with others
I can relate to that aspect a lot
I also like her funny hat being a mix of a ghost's bandana and the typical ZUN poofy hat, her little brooch, her beautiful messy hair that reminds me of my own, her beautiful poofy dress, her adorable color palette, her music theme being the embodiment of winter...
There's just way too many things I love about Letty I can't really list them all

Hmmm... I would love to get more into the Rozen Maiden manga, Yu-Gi-Oh animes and uhh I don't really know ;;

Favorite tech card.... it's probably Small World, the fact that you can just search anything... from kaijus to handtraps to starters to extenders to literally any meme card... it's just fascinating to me, and the minigame involved is so much fun, I love finding new paths in my deck both to satisfy my curiosity and to have more options whenever I'm searching.
Also the fact it reveals for effect doesn't give away immediately what I'm trying to do

Favorite food? Hmmm it's hard to choose one single thing
Probably tuna, canned tuna
It's the best thing known to mankind and cats alike

I actually like Alice, she's on my top 15
She's talented but also clumsy and extremely awkward and it's really cute and also menacing
She's just the perfect embodiment of chaotic good

It has changed many times, it's sometimes hard to tell
I like Hina, Kogasa, Satori, Kana, Raiko, Kokoro, Junko and many others...

My favorite ship!
They have a cute doujin together and it always melts my heart
I'm sure they'd be good friends despite their differences
Love them a lot~

Both are sweet and refreshing
Grapes are easier to eat though, and don't hurt your mouth the way pineapple does
Yet I also like the flavor of pineapple a bit more
Uuuuuhhh
This is genuinely hard
Probably grapes, but just barely

I don't understand the question

Not sure, Letty is always nearby so that helps

10/10 hug material for sure, unless you can't deal with the cold...

I love Yabu! One of my favorite Lenen's
They're so awkward and always come up with funny terms, Yabu my beloved!