Korean version of the twelve constellations necklace, four-leaf clover frame text lucky charm are very personalized gifts. For your sister's personality, why not treat her and her boyfriend to a big meal, she will definitely not be able to resist the temptation of delicious food. If the big meal still can't satisfy her, give her DIY hand-painted chocolates. She will definitely like such a unique gift.
Plush toys should be very ordinary for her. Why not give her a dreamy luminous plush toy? Even in the dark corner, it is shining. Your gift will definitely give her enough shock, and she will definitely love it. Or a luminous pillow, these gifts that look very dreamy will definitely arouse her possessiveness. It will definitely please her.
I don't know if your friend likes music. If she is a music fan, you can give her a mini subwoofer. These gifts are both very personalized and beautiful. The most important thing is that its pronunciation effect is shocking enough and very practical.