this may sound weird but i wanna buy a highlight(trying it out) but im not sure which color would go with my blue velocity (blue overall with neon green on the sides)
Screaming Green Highlights. 
If they are in stock. If not, Yell-O or Orange.
Also, you just made a post about strings. I would suggest you have modified that one instead of making a new post.
yeah i don’t really think about things ;D
Look at the floor where you yoyo the most. Pick a color opposite to that, AKA White Floor = Black String or Blue, Brown = Orange, Green, Yellow, Pink, etc. If you can’t see the string when playing, it doesn’t matter if your string matches your yoyo.
neh i just wanna buy string for to match my yoyo since i pretty muck play anywhere
Good choices. I would have suggested those.