If you are looking for twins or couple cosplay ideas, pokemon Subway Boss Ingo and Emmet would be an ideal choice, of course, if you also don’t mind crossplay, these two guys also would make you cool and recognizable. And actually, more female cosplayers are doing this pokemon cosplay than male.
Here is a group of pictures of Pokemon Nobori and Kudari cosplay done by Japanese cosplayers, and two of them are girls. But they do look like the two guys in Pokemon. Great work!