There are a bunch of yukkuri who often says something that is unique to them.
I thought of listing them for reference, and maybe discover some more if you guys know any.
Marisa
"ze" is Kirisame's catchphrase too.
Reimu
For the most part, she's lost in translation.
Reimu almost always end her sentences with "da yo", and some artists have played on this by making her say it like Marisa's "ze".
Something like "かわいくて ごめん ね! だよ!" (sorry for being so cute! da yo!).
The problem is that "da yo" often is actually part of the sentence ("da" is a verb), so it can't be written as-is but has to be translated
Alice
She's very city-sect. Definitely not a country bumpkin.
Also "nhoooo" I guess.
Chen
She gets it.
Ran
Youmu
Even the actual half-ghost gardener goes "myon" in pretty much every fanwork.The yukkuri goes "dick!" too.
Patchouli
I wonder what ZUN was thinking when he made Patchy go "mukyu" after you beat her.Meiling
Jaooooooooooon!]Rumia
Is that so?Aya/Kimeemaru
Ohh, catchphrase, catchphrase.Sanae
The japanese language has different words depending on how polite/humble/formal you have to be, and Sanae usually uses very polite words, compared to other yukkuri, so I believe we can consider this her "catchphrase".Remilia & Flandre
U~ u~ u~!Also Remilia goes "dado".