Anime pictures are perfectly alright, BUT I also require a written description. A picture is only ever for additional visual description.

As for a lightning elemental: There is Raijin, a Japanese Lightning God. There's also a Thunderbird (North American mythology). I suggest that one if you want something that can trigger lightning clouds and call down lightnings. 

Regardless of which you choose, I highly recommend researching them before you start making your character to make certain that you can make a powerset that's similar to the actual mythic creature :)