こぇのか instead of こわいのか


I have two questions regarding this.

1) Since, modern Japanese doesn't have a "we" character, they use "ぇ", right?
I've heard many shows where they say "suge! yabe!" but is "koe" used often? I
said I wanted to use this "こぇのか" instead of the "こわいのか" because I wanted to
make it sound slangy and informal.

2) is the の necessary in these sentences, if we were to remove it, can we
still get the same meaning? Like, "こわいのか" translates to "Are you scared?", so
we remove the "の" in this and hence we get, "こわいか" Does this still mean "Are
you scared?"




As you may have noticed, there are various slangy forms of regular adjectives
such as:

格好いい → かっけえ／かっけぇ

凄い → すげー／すげえ／すげぇ

悪い → わりい／わりぃ

怖い → こわぇ／こええ

If you type either こわえ or こええ, you will get a suggestion for 怖え／恐え.

As for の, remember that it's just a different form of こと, so it is optional in
this case because the meaning doesn't change much.

怖いのか？ → Are you scared?

怖いか？ → Scared?

