My modern take on these two Dragon Ball characters I love. For the record, my Trunks is half White/half Japanese, and my Android 18 is Korean, in terms of visual ethnicities.

I was inspired by a lot of different elements, here. A Trunks redesign by InHyuk Lee, Trunks and Android 18 designs by Kyler Clodfelter. For Trunks' hair, my main reference was Drew Van Acker (Garth/Aqualad in Titans).
I thought of some K-Pop influences for Android 18, but I didn't incorporate a ton here. Hope to do more in potential future designs.

Be sure to scroll down to find my alternate take of Future Trunks with long hair.