I feel that classes for the Bat would be Investigator (maybe 7+ lvl here) as the main class, ranger (3-5 lvl here) as the secondary class, and just a plush of monk (maybe 1-2 lvls here). Let's face the facts here Bat Man is an investigator/detective at the core of his role in the D.C. Comic universe/rich CEO play boy (as Bruce Wayne). The parent classes for the investigator are rouge and alchemist (int, dex as the main stats). The animal aspect of the ranger (aka- bat [dark vision]) and the favored enemy as human/any humanoid race. Plus the ranger has armor available to him via that class. Bruce is human but I feel that half-elf help us out better with the multi-classing we are doing here. The highest stat is a tie between int and dex, with str as the next highest, con will be the next highest after that, but cha and wis will be a min of 12 each. Light armor is best at low lvl and med-heavy armor at upper lvl. As with any rouge base class the thieve's tools (,masterwork) is a must to use disable devise at the best it can be. His top skill checks will be knowledge (local, engineering), intimidate, disable device, and diplomacy bringing up the rear. These are what I will use for my version of the dark knight.