I was just thinking about this in the shower, and have a lot of questions that weren't immediately obvious from a quick google:
Did the defendants have legal representation in the first place?
If so, were their lawyers public defenders or privately retained?
In either case, were the lawyers Nazi sympathizers, anti-Nazi activists, or just regular lawyers doing their jobs?
Were any of the lawyers Jewish, or otherwise members of demographics that had been victimized by Germany?
Did the defendants share a lawyer / legal team, or did everyone have their own separate representation?
If any of the lawyers were public defenders, which country or countries did they hail from? Were they provided directly by their home countries' governments, or via some international body?
How competent was the legal representation? Were they genuinely advocating on their clients' behalf in good faith to the fullest extent of the law? Would a modern-day lawyer (with relevant background on the historical context and contemporary international law) watching the trials walk away with a positive opinion of them?
While certainly not a complete answer this response by u/kieslowskifan touches upon some of your questions, namely the first and last listed queries.