But later on (page 168, right column) in the 'Characters from other Palladium Games' section, there appears to be a contradiction to this:
Robot & Power Armor pilots, should they survive their initial arrival, may be able to adapt to becoming:
1) a Dreadguard wearing Host Armor
2) an Outrider piloting a War Mount
Per page 13 (crossing dimensions) the Robot/PA pilots would probably have no incentive to make such a change until they unsealed their environmental armor, at which point they'd better unsuit quick before it kills them. I'm thinking a friendly Technojacker would be incredibly useful for helping Robots/PAs during that transition period since they can merge with it prior to unsealing the environmental so that they have as much time as they like to get out, and then walk the suit/bot to a safe distance (or perhaps let the Technojacker use it)
Since Dreadguard and Outrider are OCCs (pages 149 and 151) this conveys the impression that at least these two may be exceptions to the no-multiple-OCCs rule. Thoughts on this?
It seems to make sense since they appear to be two of the less invasion classes. I can totally see why things like Biotics, Saints, Skarecrows and Skinjobs would be unfriendly to multi-classing, since they all transform the human into something different, becoming all MDC and special powers and weird and stuff.
However, the Archangels, Packmasters, Roughnecks and perhaps Technojackers don't seem like the above 4, they seem more like the Dreadguard and Outrider in that they merely interact with gear rather than become it.
Since you have to be naturally plague-immune to be a Technojacker, it's unlikely most immigrants could simply switch to that though. Perhaps GMs could mandate a 1in100 percentile roll to see if someone has what it takes. Otherwise, the Arch/Pack/Rough options added to Dread/Out would bring the total options to 5, I think.
I also don't think there would be any issue with changing from one of the five skill-based classes (Archangel/Dreadguard/Outrider/Packmaster/Roughneck) to a Biotic because... well, they get memory-wiped so you would just lose all your old OCC skills, but could presumably keep playing a character with the same look and baseline attributes. I expect the Biotic process would prevent you from using a Host Armor or other stuff though, right?
Page 143's reasoning for no multiple classes is that characters are 'genetically modified', but I think that only covers the Biot/Saint/Scare/Skin classes which I explained previously I think this may have been more focused on, so that you don't have some crazy guy trying to be all 4 at once. I can also see how any of these 4 processes would interfere with becoming any of the other gear-based classes since it probably interferes with using Host Armor.
It's also clear that someone can not simultaneously be a Technojacker or one of these classes since they are mutually exclusive, the nanobots preventing symbiosis with the armor and stuff.
I do wonder though... if a Technojacker was sent to Nightbane (the barrier around that dimension would destroy his nanobots) and then came back, if they would somehow get altered nanobots (their body altering the normal ones in the environment?) or if they would lose their immunity (and all Technojacker powers, just keeping the skils) and thus be able to switch to one of the other classes.
The reasons against switching, beyond genetic restrictions, seem merely to be attitude-based ones, meaning most people would not want to switch, not that it's impossible, save for the genetic4.
I also don't think there would be any issue with changing from one of the five skill-based classes (Archangel/Dreadguard/Outrider/Packmaster/Roughneck) to a Biotic because... well, they get memory-wiped so you would just lose all your old OCC skills, but could presumably keep playing a character with the same look and baseline attributes.
I expect the Biotic process would prevent you from using a Host Armor or other stuff though, right? So there probably isn't any doing of that in reverse. Biotics are probably too feral to learn another OCC anyway. If Splicers utilized RCC classification, it would be a prime candidate for it.
I think Saints, Scarecrows or Skinjobs (three other RCCish things) might be prevented from becoming a Biotic though because they are already transformed?
Although these 4 RCCish classes may not be able to become the 5 other skill-based OCCs due to inability to use Host Armor or similar, I do wonder if they could switch to other OCCs when leaving the Splicers dimension. The main impediment would be using technology, since they carry the infectious nanobots with them. But that would still leave a lot of non-tech classes open. Biotic Saloon Girl perhaps? Skinjob Fleshsculptor?