They are supposed to be fully grown at around 3 years but they won't continue to grow beyond that as they get older.

What will happen over the years though are some quite significant internal changes.

For example, if Vilkas was stabbed then it would be quite a serious ordeal, he'd bleed, his internal organs could be damaged, he won't die from it but he'll be crippled for a while.

Vilkas father on the other hand would merely frown at being stabbed, it'll hurt but two hours later he'll be healed.

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Chapter 8, Vilkas father mentions that he's 230 kilos which is a fair bit from 280.

Hybrids adapt to their environment, Vilkas father spends most of his days in a chair at RIWER thus his body has taken on a more 'civilian' look, if he visited or worked beyond the wall for an extended period of time then his body would adapt and grow. (Height rarely differs)

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I'd rather not explain too much as the story will explore these matters later, i can say this though, no sane hybrid would willingly see the end-stage come to fruition, both for the sake of others and the self.

No worries, I appreciate you not giving us spoilers. How the end-stage occurs has been hinted at, in that the symbiont grows weaker and I assume either dies or is overtaken by the lusus. Lilia has said she can't stand to see herself as her form has changed. Vilkas could not smell her scent anymore. I think her scent has radically changed and the barrier was able to keep him from scenting her. She was still very lucid despite her end-stage beginning. Perhaps it is because it is unknown, or more likely that the way the hybrids progress through the end-stage is completely new and novel has us so interested.

Thanks for clarifying they stop growing (size and height) after 3 years. Do the internal changes after 3 years include increasing strength, agility, and mental focus? If the mental focus improves, does that extend to improving usage of mindscape and waldo? Or is the power and ease of using mindscape and waldo improve simply from their hybrid adaptation to what they encounter in their environment? I hope I'm not pestering you too much with my curiosity! *grins*

The internal changes do include strength and agility. I wont comment on the focus part.

Aptitude with the mindscape is dependent on four things...

1: Symbiont Genetics (This sets core abilities and potential, which is improved by new designs)
2: Human Genetics and brain layout (This is the wildcard, some are lucky, some aren't, those born from the artificial womb has an increased compatibility)
3: Maturity (Modifications to the brain takes time, that's why even short exposure to the mindscape is so tiring and even painful to Vilkas and the others)
4: Training (Training allows one to reach the potential set by the first two)

Almost all hybrids can enter a mindscape forum and debate ideas/politics with ease, very few can control and submerge themselves in an army of drones or make full use of the nanite hardware.

Thank you =)

Chapter 14 July 6, Vilkas mentions that he weighs 130 kilos.

Chapter 17 (latest) plays out in October and means that Vilkas should be around 150 kilos which is the middle stage at around 1 year.

Good lord, now i can't help but see it as well.

Wonderful! Always glad to share the pain. :P

LOLOLOL

Hehe

Nope, haven't spent the time to make one without fur. (While I did give art a try, I was never any good at it)

Might make something for the future, I'm just far too bogged down with the weekly releases of Walls 2.

They do make a good fit...

From weakness of the mind, Omnissiah save us...