[neatoman]

Originally Posted by Sumac

Precisely.

The problem is, I think, is that none out of TMNT incarnations specifically made any exploration of Shredder character. I haven't read IDW stuff, so maybe they had something like this, but from what I have heard here he is just a dude who want to conquer anything.

http://tmntentity.blogspot.se/2013/0...ot-clan-1.html (Follow the whole mini-series through the end).
http://tmntentity.blogspot.se/2013/1...-shredder.html
http://tmntentity.blogspot.se/2015/10/tmnt-idw-50.html

In case you don't care about spoilers:

Spoiler:

He is the reincarnation of the Foot Clan's original founder.
The founder was betrayed and murdered when his clan disagreed with his violent ways. When Saki found this out he couldn't stand disloyalty and took over the Foot Clan. Eventually we find out he's a puppet of Kitsune,
a Demi-Goddess who groomed him to become a hostbody for her father.

Originally Posted by Sumac

As a result the most explored Shredder is the one from OT, just because there was so much of him in the series.

Technically? I can't say it's the least bit compelling though. He's just a buffoon bickering with an Utrom there.