There is one word in here that makes this analysis at least PG 13; even though there is only one word I just don't want to take an chances. 

One relationship that would be  interesting to portray in future series of Reboot is how Matrix's relationship with his brother Enzo will progress when he becomes a young adult. And what would be interesting is if their relationship is portrayed like Sam and Dean Winchester from the WB's Supernatural series.

First off I don't think that showing Enzo asa young adult means that there will be a second Matrix. If anything it can show how different he is, no matter how similar he looks like Matrix. For one thing Enzo is a Guardian and Matrix is a Guardian Enforcer; both work to protect the net but in different ways.  The difference in his personality will also set him apart. With Matrix, there were signs of his infamous temper when he was little; though Enzo showed signs of the infamous Matrix temper it was only because he was confused. Once he realized he was his own person he calmed down some. He also seems to be a bit smarter since he was the only one who knew or cared that Glitch Bob was the real Bob.

To me that shows that Enzo will grow up to be more cool headed and more easy going. I also think it shows he has more maturity.

Enzo as a young adult will also add some more conflicts for him and Matrix . Matrix will have trouble seeing him as a young man annoying Enzo and yet at the same time they can grow closer. 

Matrix and Enzo's future relationship has the possibility to be portrayed similarly to Dean and Sam's relationship, which is one of the reasons why Supernatural is such a big hit.

For those of you who don't know what Supernatural is about here is what hopefully is a brief description from tv.com:  Supernatural stars Jensen Ackles and Jared Padalecki as Dean and Sam Winchester, two brothers who travel the country looking for their missing father and battling evil spirits along the way.

It is funny to watch these two guys because even though I don't have any brothers, from others who do say that it the show is realistic. I can also see Matrix and Enzo having the same fights and friendship in the future.

An example is from Season one's episode Phantom Traveler  where a friend of Dean's calls him up when a plane crashes under mysterious circumstances.  What is really funny is Dean has a fear of flying in planes when he has faced Demons and monsters.

Dean: Sam, this plane is going to crash, okay? So quit treating me like I'm freakin' four!
Sam: (very calmly) You need to calm down.
Dean: Well, I'm sorry I can't!
Sam: (still calm) Yes, you can.
Dean: Dude, stow the touchy-feely, self-help-yoga crap. It's not helping! (edit)

http://www.tv.com/supernatural/phantom-traveler/episode/465117/trivia.html

I doubt Matrix will sound just like Dean, but he probably would say something similar around those lines.

Another episode called "Faith" shows how Sam takes care of Dean and vice versa. What i funny about it is that it is more in argument than sentimental and something I can see Matrix and Enzo argue:

Dean: Man, you're a lying bastard. I thought you said we were going to see a doctor.
Sam: I believe I said a specialist.

Another episode called Route 66 shows how the Winchester brothers works:

Sam: Where are you going?
Dean: I'm going for a little ride.
Sam: What?
Dean: I'm gonna lead that thing away. (pointing to the truck) That rusted piece of crap, you've gotta burn it.
Sam: How the hell am I supposed to burn a truck, Dean?
Dean: I don't know. Figure something out.

If you  put in Enzo as Sam and Matrix as Dean and put some Reboot terms in it isn't that far fetched. Also add a Bob with his head in his hands and you get a very interesting episode.

For the sentimentality well is snippet from "The Benders" episode, where Dean has to rescue Sam from a backwoods family that hunt humans and for trophies collect human body part:

Dean: Don't ever do that again.
Sam: Do what?
Dean: Go missing like that.
Sam: You were worried about me!
Dean: I'm just saying, you vanish like that again and I'm not looking for you.
Sam: Sure you won't.
Dean: I'm not! (edit)

Relationships between these two brothers should be explored, especially with Enzo as an older teen. This will create tension between the two but could also pull them closer together. I am not saying this should in every episode but it would be nice to see it more than in season 4.