MechaEmperor7000 wrote:
Independent characters are a weird thing because the wording for some special rules have gotten...sloppy.

Namely a lot of formations now contain rules that read "any unit from this formation", but don't specify what you do if an IC from outside of the formation joins it. By the strict wording, it doesn't matter, as it refers to the unit as a whole. But this obviously runs into some questioning such as "how does a unit that have special training and/or mutations suddenly confer them upon a character who clearly has neither".

Just note that, for the purposes of Army Building, no you cannot add units to a formation that's not stated on the formation itself, at least not without special permissions (the IG commissar is a notorious case of this). However during the actual game (yes, even deployment) an IC can join the unit so long as there's no restrictions. In the above case, if Njal was wearing his terminator armor, he could join the Void Claws as they deepstruck in (unless that itself is illegal, I don't have the time to look up the exact wording on the formation or Njal's rules). he would, in theory, also benefit from the rules, but for the purposes of detachments and army building, Njal isn't formally part of the formation, just joining it.

Also, please excuse Ghaz. He can be...excitable at times.

EDIT: Also, for future reference, rules questions should go into You Make Da Call forums. It's specifically made because GW's notoriously bad grammar checking leaves a lot to be desired and if rule questions are made in the main discussion area, it'd be nothing but rule questions.