Recently, it came up in a
thread that Fusion doesn't seem to specify the form it grants.
And it was brought forward that form was a natural ability and would be included under the 'racial ability' section of things fusion grants you from both creatures.
The problem with this, however, is that I cannot find any rules that state or even imply that form is an ability (if it is an ability, it is indeed a natural ability, that part's not in dispute). In fact, the strongest implication is that form is not an ability, as spells and the like can grant abilities without seeming to grant form.
Now, this topic is interesting to me for two reasons.
Firstly, if form is not an ability, then the form of a fused creature is not discussed in the rules in any way that I can find. This means that, as long as it's reasonable, you could make your fused creature into any form you desired, from as mundane as granting it four arms when fusing two two armed creatures to fusing with a centipede and giving yourself 102 arms and 2 legs but otherwise being entirely bipedal.
Secondly, if form is an ability, any spell which gives you the natural abilities and/or racial abilities of a creature automatically gives you it's form (including size) as well. It also means form (in whole or in part) can potentially be altered by the spell "Trait Removal" from Serpent Kingdoms, as well as others that have similar effects.
What do you all think?