I have decided that my next character on Skyrim must be batman but I don't know what species, armour or weapon specialisation to use.
Pleeeeeeeeeease help?

Breton, Unarmed (Never allowed to kill anyone), Nightingale armor.

The first question you must ask yourself...Can you pull off what you want to do with this incarnation with the game as is?
Batman is really big on the whole swooping down, and there's not a lot of swooping that can be done.

Though a Skyrim Superhero type might work.
We lack capes though.

Point taken and well made, good sir.

we need more capes
They should make an entire DLC of capes of different colours

All the bugs, glitches, and design flaws stop me from role-playing, because I can't take this game seriously in the state it's in.

Hey what about other batman villains and heroes such as the Joker and Mr Freeze are any of these possible.

I can shout people off cliffs. I stopped taking it seriously a long time ago. I just take my role play a little more goofy.
Do it in the style of Freemans Mind. It puts things in perspective.

Mr Freeze- ice form shout, ice staff and daedric armour with some sort of weird helmet