I just mean to say that "he" is more or less the default pronoun in English. When people mean to speak of a person of unknown gender, they will usually say "he" or sometimes "they", even if it's no more logical or correct than "she" or "it". And it would sound weird to say "they" for Big Chill, because it would sound like there was more than one of him or something. Thus, for better or for worse, people use "he".
To be honest, there's not much to be said for Shellhead. He has not, to my knowledge, been officially mentioned in any context, fictional or otherwise, since Ken 10 aired. If this is about rumors that he'll appear in T.G.I.S., I must admit that I doubt it. Most recently created aliens were known of ahead of their debuts in the cartoon, and while whatever happens in T.G.I.S. is a well-kept sectret, the fact that we've heard nothing about Shellhead seems evidence against his appearance rather than for it. On the subject of Ken 10 aliens, I think that a major part of why Toepick got to appear was because nothing was known about him, other that that he is gross. The creators got some freedom with him and his powers could be a surprise. Unless Shellhead has powers that we don't know of, and Kenny made it pretty clear that he probably doesn't, I don't think the creators are inclined to bother with him. As I see it, Sandbox, Atomix, and Snakepit are more likely to appear than Shellhead.
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yo dude fasttrack will appear in t.g.i.s because derrick j wyatt said that fasttrack will appear one person said that shell head will make an apperance but i dont belive that but buzzshock will also so don't think i'm lying cause i'm not
I'm willing to believe what you say, but only if you can properly support it. Otherwise, I will be forced, on account of my contrary evidence, to believe that you are either lying or tragically misinformed. For you convenience, I will give you my evidence. First, if you go to the Omniverse episode production order page, you will see that T.G.I.S. was intended to be the first episode of arc 3. Then, if you go to the Fasttrack page, you will notice two links to Mr. Wyatt's Formspring page. The first one will inform you that, as of January 19, Omniverse Fasttrack had not yet been designed. The first episode of arc 3 that aired, Ben Again, aired the same day. Therefore, we know that arc 3 had been developed before Omniverse Fasttrack was even designed. And if you go to the second link on the Fasttrack page, Wyatt can further inform you that Fasttrack will not appear for the first forty episodes of Omniverse, and T.G.I.S. is episode 21.