Last I remember, Magolor doesn't have a descendant. So, no.

Another hint: The descendant is identical to the character except the ship captain thing.

Linebeck of course

That's the one!

I've got one now:

• Is a minion to the supposed final boss
• Scottish
• Gets brainwashed by a plant

Any other hint? I still can't figure it out

Mishears the main character's name and never corrects himself

I got it! It's O'Chunks! He's scottish, a minon of not-final-boss Count Bleck, and calls Mario by the name of Shadow's dead sister figure.

yup

Here's one:

Has a suit/cybernetic body that kept him alive and immortal till the final boss fight.
Had the same voice actor Eggman did.
Solely responsible for a war that almost rendered 2 sentient races extinct.
Arguably THE most malevolent and despicable villain in his franchise and one of the most evil video game character I've seen.

Dr Weil

Here's mine.

1. Supposedly dead after defeating a doctor fused with a space station.

2. Encountered Mr. Karate in SNK vs Capcom.

3. Has a green energy sword and a buster.

Zero

Correct on both accounts I believe.

Here's another:

Yellow in color.
Has sharp teeth.
Uses a green gun that can fire different kinds of shots.
Fights at least 2 governments and a member of his own race (supposedly).

Any other hint?

that one alien from some newgrounds game i think