Imma give you some tips to choose a caracter to cosplay.
1 - First of all, you need to chose the gender (yes, female can cosplay as a male too, I don't see any problem with it u-u).
(good exemple os girl cosplaying as a male fictional character 'Luffy')
2 - You should focus on a character that has the physical caracteristics similar to yours or even the personality, I mean: short or tall, skinny or overweight, funny or serious, social or anti-social and etc. However do not choose a character you don't like just because he/she looks like you, also it doesn't need to necessarily be identical, just in a general way, if you preffer (obviously).
(you need to determinate a limit on how much is okay for physical caracteristics)
3 - The clothes is something you should think of too, something like a armor for exemple is way more complicated than a shirt and pant or even a dress by the way fabric wrong can also make your cosplay look wrong or something (unless it's a different version).
(look at this armor, the details are faithful to the character)
4 - I guess that's all when choosing a character, just don't forget about the personality and have fun~
- Konata-Chan