I'm hoping for a villain with an army and a powerful leader. Kinda like a game with a boss. After the spend a couple episodes going through the henchman and different places to find the leader. They encounter him and find that it's not gonna be easy to defeat him. Here's how I'd like it o play out.
Episodes 1-4 and episode for the members all learning of their new villains and assembling or being assembled.
Episode 5-9 a journey as the team learns to work together splits up and looks for clues, trying to locate the villain and stop all of the schemes and activities tries to come up with a name, Danny Rand has Rand Industries so he can easily provide them with costumes and a base(seems like something Luke and/or Danny would do, they could have a bromance throughout the show)
Episode 10-13 the homestretch as the Defenders begin to get closer to the head. A war breaks out and there's a little more adventure through NY, Crimefighting and then they come up with the name in the process of trying to Defend NY become the Defenders. They encounter the powerful villain whomever he may be and either defeat him easily, or he turns out to be some super powered god like villain that they have to team up to stop but have extreme difficulty doing. either that or a final cool battle with some cool army villain of soldier ninjas with guns or some sort of weapons or something. Oh and they need a break up episode. Or two, like they get tired and split up deciding to do things their own way but discover they are stronger together than they are apart. They can kinda be like TV's Fantastic Four
Cage-Thing(Super Strength, Unbreakable, Catch Phrase, Need I Say More?)
Jessica-Invisible Woman(I dunno, female?)
Daredevil-Human Torch(Well, Daredevil Does See The World On Fire.)
Iron Fist-Mister Fantastic(I dunno, male? Rich? Is Reed Even Rich? Hey, gimme a break, I'm tryin. Throw me a bone here!)
I dunno. You guys get the point.