Oliver (Funko)+ Contest!

Well, after a lot of posts about new characters in development, I finally have one pretty close to being finished. I may want to change his design a slight amount, but am thrilled with how he looks overall. Figured this styling would be a fun and easy way to introduce him as well! Now he plays a pretty important role in my story, but I'll leave that for all of you to figure out. So, my question for all of you is who do you think his sibling is? Also his color doesn't really provide much of a hint. Let me know in the comments below or send me a note if you want to if you think you've figured it out. First one to get it or very close to it will get a prize from me so think of this as a contest within a piece! I'll give you a hint as well, look at how he does his autograph. His sibling may or may not sign in a similar way