@OP: well, you asked for it; so here it is:
Just as an inconsequential side note, before I start -- I assume that you mean "cobra strike", as opposed to "passive way", in order to get dodge as a bonus feat (doesn't change anything, just swap-out the terms).
I have to admit that the builds for the kobold and the creature are impressive. As impressive as final product might be (as is the work put in to the endeavor), I do have a few issues with the method, as well as some assumed definitions.
First, definitions:
While you have created an impressive creature, it is far from a "20-level PC". While you did indeed get there in 20 levels, in order to make it all happen, you must become an epic creature ("epic" being defined by the taking of "epic" feats -- if you qualify for "epic" feats as a character, then you are, by definition, and "epic" character) -- I could articulate that point further, but I think that should do it. Additionally, as a matter of fact, by definition, aberrant limbs makes it an NPC:
These unique abilities were created for use by NPCs, not PCs.
Furthermore, the cohort issue. You may call this "interpretation", but cohorts can't take leadership and expect to remain a cohort:
<snip>
Cohorts are not leaders.
<snip>
(of the leadership feat): A character with this feat is the sort of individual others want to follow, and he or she has done some work attempting to recuit cohorts and followers.
That description sure sounds like a "leader" to me. I'm sure custserve could be enlisted for this, but I doubt that you would consider that valid (unless, of course, they would agree with you).
The above two issues may seem like petty minutiae; but, it is what it is. "Theoretical" or not, some things just simply cannot be ignored just because you feel like it.
Now for the cohorts themselves:
Circle magic. Where are your other 2 Circle participants coming from? Neither the kobold nor the psion cohort are able to be participants. No Circle, no CL 25. No CL 25, no lizzipede. No lizzipede = fail.
Next -- feat retraining.
In order to retrain a feat, you have to be eligible for the new feat. "Bonus vile feat" feat slots are only available to vile feats. Non-vile feats are not eligible for these feat slots -- retrained or otherwise (please, let me know if I'm missing something here). This means that you have "illegal" feats, making this an "illegal" build. Nice try, though.
Then there is the statement that demonstrates what seems to be your guiding philosophy:
Also, to note; this blatantly ignores wealth by level, but with a psion and wizard as cohorts, just choose your method of breaking the standard wealth scheme.
By this philosophy, "theoretically", a 1st level commoner could do this very same thing (given enough time, of course). If it can be done by a 1st level commoner, then just how impressive can it be?
Basically, your cohort and wealth abuse fall in to the "'I'm a little tea pot' healing method" catagory -- an approach that I simply cannot take seriously. Also, your apparent claim that that
thing you become can in any way be concidered a level-20 PC is likewise preposterous. Your feat retraining is simply a case of you making-up rules as you go along --
Otherwise, cool creature, and nice work on the kobold (actually, the creature is pretty bad-ass).
Like I said, you asked for it.