Well here's some list what my friend (named Minako) invent:
Kurogane: "Kyaaah!! There is a big meanie-monster! Waaah! Please Fai-sama, come and save little meeeh~"
Kurogane: "Lalala-laaa~! It's such a wonderful day! It's sunny! There are flowers! And so many cute cute cute little bunnies!"
Syaoran: "Come to think of it... these feathers must be quite rare... Any idea how much money they would give me for this? 8D"
Mokona: "Syaoran, you know... this feather business is very troublesome... How about it? You and me? Tooogetheeer?
"
Mokona: "Puu!" (Mokona haven't yet in Tsubasa sayed this word)
Sakura: "You know, Syaoran. You weren't my only one. I guess you didn't know about the thing with Yukito.... and my brother... and you father... and that guy... what was his name again...."
Syaoran: "Buuuhuuu, nobody loves me. I'm all alone. Buuhuu"
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And here's some mine:
Kurogane: "Love and the peace!" (just like Vash from Trigun-serie)
Syaoran: "When I get married with Sakura, I can rule the world with her power. Myahahahhahahaha~!!!"
Fai: wuh wuh (bark like dog)