Hey ive just set up the article entilted Boss Battles for the LEGO Batman Video Game Wikia due to every LEGO Video Game Wiki is to have one and a complete collection of these enemy challenges and their walkthroughs can be found on LEGO Games Wiki.
Also there is more upcoming LEGO Video Games much like LEGO Batman such as LEGO Marvel the Original Heroes whcih from Traveller's Tales spitbulled ideas the Spider-Man episodes available on the game are set to be great.
There is also the upcoming LEGO Pirates of the Caribbean which introduces the boss of every level and not just Penguin Submarine and Two Face's Armoured truck shown in LEGO Batman and theres the upcoming LEGO Superman which has a wikia already detailing its information.
Theres also a LEGO Lord of the Rings based on the film adaptions of J.R.R Tolkien's acclaimed novels Fellowship to Return.
Theres is also the announced LEGO Buffy the Vampire slayer with its own original story inspired by the television series and character.
Anyway glad to help:)