I think this is one resemblance between Satan and God's Son. They are all confronted with a situation which no one else is brave enough to solve and they both stand out.

Although Death is horrifying, Satan is not afraid. Faced with dark enemy, he is as brave as traditional heroes.

So Satan takes this task no only because of bravery or hatred but of the king's pride.

Here is a proof of Satan being an epic hero. He has strength and bravery to accomplish a very difficult task, a task that no one can do except him.

The process of Satan's plan is quite logical and effective. But the goal of the plan somehow is not very reasonable. The former fallen angels are talking about how to handle the situation. They want to get out of the pain, but to destruct what God likes is not a way to achieve that. I doubt whether Satan has been driven mad by torment and hatred. This plan can do no good to him except that it can satisfy his enormous ego. As if destructing Eden can destruct the creator of Eden! But perhaps he secretly knows their situation is hopeless so he has no choice but to spend his efforts on making things worse...

Misery wants company...

This is ridiculous. Satan just summarizes the disadvantages of the hell, and then he implies that those disadvantages are the advantages of their union? Maybe union is true(because misery wants company), but when it comes to faith or firm accord, it is too much. It is more like a twisted union bounded by misery. Maybe he says this for encouraging everyone because latter hes' going to find that falling from the heaven is everything but an advantage.

Satan is like a leading hero in the army of fallen angels.

What a great spirit! Although they failed, Lucifer and their fellows are doing something needs great strength to do.

Here character's will appears to be powerful and changes the world a lot, just like nobles in epic poems.