Yuzuru Otonashi is quite popular. His mysterious past and his role as a leader in the SSS make him a central figure in many fanfictions. Also, Angel (Kanade Tachibana) is popular. Her cold exterior and the mystery behind her actions are often explored in fan works.
I'm afraid I can't answer who the main characters are in this novel. You could check the book's description on the cover or at the back, or look for some reader reviews which might mention the main characters.
Dante is a main character in many Blood Angel novels. He is the Chapter Master of the Blood Angels. He is a powerful and respected leader, guiding his brethren through many challenges.
The main characters include Tessa Gray. She is the central character with her unique powers. Then there are Will Herondale and Jem Carstairs. Will is a Shadowhunter, who is complex and has his own secrets. Jem is also a Shadowhunter, and he has a special bond with Will. There are other characters as well, like Charlotte Branwell, who is in charge of the London Institute of Shadowhunters.
Obviously Naruto would be the main character as the title implies. But there could also be other characters like Sasuke who might be influenced by Naruto's angelic transformation. Sakura could also be there, perhaps helping Naruto understand and control his new angel powers.
I'm not sure exactly as I haven't read it. But it could have the 'angel of darkness' as a main character. There might also be a human character who is somehow involved with the angel, like a detective trying to figure out the angel's motives.
Not having read the 'angel of wrath novel', we can only speculate. The main character is probably the angel of wrath itself. There may be side characters such as those who are the targets of the angel's wrath, for example, sinners in a religious - inspired setting or enemies in a more general fantasy setting. There could also be other angels or spiritual beings that play important roles, either trying to temper the wrath of the main angel or being drawn into its actions.
Since I don't know the exact 'fallen angel novel', it's difficult to name the main characters. But usually, there would be the fallen angel as a main character. There might also be a human who gets involved with the fallen angel in some way, like a love interest or an ally.
Since I don't know the exact 'angel falls novel', I can't say for sure. But it could be a young adventurer who is drawn to the allure of Angel Falls. Maybe there's also an old local guide who has a wealth of knowledge about the area and helps the adventurer.