In all seriousness, I mostly chimed in hoping that someone with more of a clue would as well. Now... well, while there is nothing wrong with what McFart, SissySalina, and (maybe) myself have tossed out, I feel like I should back it off just a little.
As it so happens, I do know a little bit about serious cosplay. Just about enough to get me into serious trouble, anyway.
Costume Play 101
1) Give yourself permission to be a child again. Remember how to play. Goofy is fine. Having fun is the goal.
2) Pick a hero (or villain) that resonates with you. I'm not talking about someone you feel like you look like unless that is your schtick. I mean someone you know beyond just pop culture references. Remember being a child and wanting to be someone. This is the chance, for at least a few minutes.
3) Now, would you be comfortable wearing the face (and costume) of this hero or villain? I'm still not talking about how you look in it, damn it. That is not important and can be worked around. The question is, would you be comfortable being seen as this particular hero/villain for the duration.
4) *sigh* Fine. Go ahead and worry about how kawaii you would look as the character. Frankly, I think you are wasting your time. Even Gal Gadot is going to be criticized as not fitting someone's ideal as Wonder Woman. BUT, you can work around it.
Let's say, as an example, you like Sylvanas Windrunner from Warcraft and World of Warcraft. Okay, fine. However, you don't like the thought of running around in a bikini with a pair of shoulderpads with a skull on them carrying a bow. Not a problem. The fact is that Sylvanas has myriad looks that can be played. A corset and leather leggings with lots of skull motif can be made to work.
My point is, don't be too quick to give up the character from 1-3 just because 4 makes you blush. Not before you re-read up on the character and check fan art selections. You may can do something other than a chainmail bikini. In fact, odds are that the bikini look was not really the original concept art in the first place.
5) Is anyone else in your posse going as or can be convinced to go as other characters from the same piece of work? This is always fun. Or almost always anyway. It can kind of suck if everybody wants to go as the same character, if they also don't want anybody else to go as that character.
Same character can actually be loads of fun. Especially if you work it out in advance so that one is disappearing on one side of the room before the "twin" appears (magically) on the other side of the room. You'd be amazed at how easy it is to fuck with people even if there isn't much alcohol yet.
Not so much if people get their tit in a wringer about "But, I want to go as the sexy one! You make a much better frumpy one anyway!" (Being the asshole I am, I usually took this as a challenge to pull out all the stops and prove I was the better choice for the costume.
BUT, if you can get the posse to pull off impromptu action sequences with each other, it adds a whole dimension to the fun.
6) Now, let's get technical. Do you have the time and resources to pull off what you've dreamed up? If you want to go as The Lich King, Arthas, then you should have already started. Especially, if you're going to hammer out your own articulated metal armor. (Trust me, the skulls on the knees are a stone bitch!)
If you don't have time to DIY, do you have the resources to farm out parts? Can you pick up parts of your chosen look "off the shelf"? Just a side note, the more complex the look, generally the more difficult it is to find off the shelf components on the cheap.
7) Oddly enough, make-up and hair are almost more important than the costume. That's all right, though. All I will say here is, it is majorly important to sink money in the more expensive. Stay off the Halloween aisle. That whole reason that shit is so cheap is because it is
cheap. You would do better to go play in your dirt and plants and make your own.
Conclusion; I know it wasn't what you were asking, but hopefully something pulled your trigger. Above and beyond everything else, though, have some damn fun or why are you bothering?