Is the Devil  a fictional character?

Your question does NOT do any convincing for me, the devil, Satan, you will definitely meet him in hell, and your atheist imagination will end after seeing the reality of the facts with your own eyes.
I have said many times, and on several occasions, and I will NEVER cease to say that, those who wish to see the spirits of demons with their own eyes, must participate in the company of true Psychics or Mediums, in séances.
This is, is will be, a proof that Satan and his Demon brothers exist!Besides, you said a big stupid thing, because you are ignorant about it, Satan is good looking, because he was a former angel of God!
Besides that, He is a perfect Mutant, he can transform himself as he wants, with, or without horns, with, or without wings, and as an Alien, etc...! Now learn the lesson, and DON'T forget what I told you! OK!

The imagery seems to be an attempt to portray pagan gods such as Pan in a negative light, but yes, the Devil exists.  Global capitalism has an eerie talent for survival which is too improbable to explain through chance alone, and in an organised fashion in spite of nobody being in charge.  That's Satan's work.  Lots of other smaller examples which are more personal to people, but that's one really obvious one.

Not according to God, and He should know.

One of Satan the devil's most successful strategies is to convince people that he does not exist. Then they are totally unguarded and open to all his various tactics for keeping them out of God's Kingdom, subjugated to his evil rule instead. But the ideas people have, based on the likes of Dante's "Inferno" are equally useful to the devil. They are based on Islamic and other religious ideas, resulting in written caricatures that are far from the truth. Go to the link below.

If you want to learn the truth about the devil, read Jesus' warning to religious people who had made the devil their 'father' without even knowing it. Read John ch. 8 vss 31 to 47.

It is someone the exact opposite of what is right and loves all the evil he can do.

try and convince charles manson that the devil is fake!

Fly high upon this love
And touch the stars above that's
What dreams are made of
Bold and beautiful are we
In love eternally
Forever you and me

No, he is not a fictional character.  He exists, but he is only an intangible spirit.

He is not the horned monster he likes to depict.  Thus he can say, "I am no devil, for there is none."

Here the answer: https://www.jw.org/finder?wtlocale=E&docid=2014803&srcid=share

Good is good, bad is bad. You don't need a god or a devil to know that.