My bad for skipping out!

Let's see if I can add something meaningful on any of these...
32. If you had to choose between a party member like KOS-MOS/Emerelda and having mechs for the entire party what would you choose?
I choose Ziggy.

Jokes aside, I'd probably like to have a mecha character somewhere. As in a mecha that is also a character.
Technically, that mech of Maria's in Xenogears could qualify, but it really doesn't do anything. Emeralda and KOS-MOS are all kinds of cool and thought-provoking, but most differences in their use of mecha are cosmetic.
As far as the newest Xeno game is concerned, the mech tutorial that was shown before the release in Japan - specifically, the way you could play around with diffferent loadouts of weaponry with different ranges, damage types, slot requirements, etc, etc - certainly got my Front Mission juices flowing, yes.
I don't think that either of these should be exclusive though. It would need the party character(s) that don't have a mecha and/or interact with them in a unique way to have sufficiently different gameplay mechanic(s) to make them a). stand out in lore, plot and gameplay b). be interesting to use c). avoid being too gimmicky to be useful in practice and all around too good to never remove from your active party.
So, really, my answer is 'all of the above, plz'.

35. With reincarnation and inherited wills coming into play how much of Elly's personality was developed naturally/organically as opposed to influenced by being the Antiype?
I prefer to think that Elly - the person she was before the game's start - was being gradually but steadily overwritten over the course of Xenogears with no trace remaining. (Just in case there was not enough horror in Xeno for your taste.)
The outro kind of gives some hope on that front though. Her promising to (maybe) not jump at the first opportunity to sacrifice herself for others next time looks like a marked improvement to the complete lack of self-preservation she exhibited before.
48 Why is Yuriev called a Salvator Child, and where did he get the Grahf like ability to possess bodies?
As we see in ruins of Michtam in Ep.III and in the fan translation of Ziggy's mobile game's cutscenes, stuffing a bunch of children full of various modifications in controlled environment on all stages of development to create a slew of smarter children to serve in the government was apparently all the rage ~160 years ago. Which is where, I believe, the 'salvator faction' in the present day comes from.
Yuriev himself, however, was born an indeterminate amount of time earlier than that. So he really doesn't qualify, as far as I understand it. Unless his most recent body was one of those children and he just covertly hijacked it, of course.
(I suspect that this initiative was his doing and served as a testbed for what will become URTV in the future, but I can't quote any sources on that, so that may be just my pure headcanon.)
His body surf ability comes as a side effect of being a mass transfer experiment subject (I can't even say 'survivor' because we have no idea what happened to his original body and how different his mind was before this happened). Xenosaga doesn't provide much more information than that.
53 Why is Xenosaga considered to be a dystopia in spiritual crisis?
Xenosaga, unfortunately, shows very little of the setting as a whole, but, considering such database entries as these:
- compressed for space:
-------------------------------------------------------------------------------
Zoar Incident 236
-------------------------------------------------------------------------------
The incident that triggered a massive war within the
Federation, which culminated in the Miltian Conflict.
Although details pertaining to this incident are unknown,
it was around this time that Cherenkov was born as a
super soldier (biological weapon).
-------------------------------------------------------------------------------
Uberhumans 208
-------------------------------------------------------------------------------
During the heyday of the Life Recycling Act, many people
opted to undergo artificial procedures to enhance physical
abilities or to increase brain capacity. This term is used
to describe those individuals or their descendants.
Although Allen refers to them as "mutants," these gifted
individuals do not exhibit any external differences when
compared to ordinary humans.
Current Federation law prohibits any acts of discrimination
against such people, yet feelings of hostility still abound
in various corners of the galaxy. The Kukai Foundation not
only protects these individuals, but also provides them
with a means to support themselves.
-------------------------------------------------------------------------------
personality reconditioning facility 156
-------------------------------------------------------------------------------
The facility to which Cherenkov was committed.
Its purpose is to literally recondition an individual's
personality by processes such as altering neural networks,
or placing implants that regulate hormone production.
In this age, vicious criminals are subjected without exception
to this procedure. Those that go through the procedure are
returned to society after they successfully complete their
re-education programs.
-------------------------------------------------------------------------------
Type 7 personality corrective procedure 206
-------------------------------------------------------------------------------
A personality control procedure administered to Cherenkov.
In this age, every violent criminal whose behavior is a
result of brain abnormalities, is given this procedure
without exception.
The procedure itself actually entails implanting a nano-
machine which suppresses emotional impulses into the brain.
However, there are a few individuals that are not cured by
this, and even more extreme procedures, Type 8 and Type 9,
are available.
Incidentally, the ratio of male to female recipients of
this procedure is 8 to 2, an increase in the proportion
of females from the current ratio of male to female
violent criminals with abnormal impulses, which is
9 to 1.
-------------------------------------------------------------------------------
Life Recycling Act 118
-------------------------------------------------------------------------------
Introduced as a bill in T.C. 4590, it passed with unusual
speed and was voted into law the following year, in 4591.
In the age when cyborg technology was at its peak, human
resources were dwindling and this law was intended for
"effective utilization" of these resources.
However, with time the interpretation of the law expanded
to condone human cloning, genetic and neural engineering,
and other procedures formerly considered to be off-limits.
Various corporate interests are suspected to be behind
this development.
This law remained in effect for 160 years, until it was
revoked in T.C. 4754.
-------------------------------------------------------------------------------
Life Recycling Variant 119
-------------------------------------------------------------------------------
A term which encompasses individuals or their descendants
who have had their DNA, neural structure, or other bio-
logical components heavily modified. Some may display
extraordinary physical abilities or superhuman powers
depending on the level of modification, but on the
other hand many suffer from adverse mental effects.
In the case of Cherenkov, he was part of a Super Soldier
program developed by a "certain branch of the military."
He was created via artificial insemination, and equipped
with several modifications before being sent off to battle.
-------------------------------------------------------------------------------
Species Preservation Act 193
-------------------------------------------------------------------------------
A law enacted in order to revive the human race, which had
degenerated due to the harmful effects of the Life
Recycling Act.
The purpose behind this legislation was to preserve and
propogate a pure breed of humans that was untouched by
genetic engineering, cloning, or organ enhancements. It also
strove to restore the original genetic code that had been
altered by the Life Recycling Act.
Due to the fact that enforcement is left to the discretion
of each autonomous state, there is a pointed lack of
standardization and effectiveness across the
multitude of jurisdictions.
-------------------------------------------------------------------------------
autonomous state 017
-------------------------------------------------------------------------------
The Galaxy Federation is comprised of approximately half
a million autonomous state governments.
Each autonomous state, divided according to planetary
systems, has its own administrative and law enforcement
agencies, but the Federation government's laws take
precedence over them all.
-------------------------------------------------------------------------------
Fifth Jerusalem 075
-------------------------------------------------------------------------------
The capital planet of the Galaxy Federation, and seat of the
central legislative, judicial, and administrative agencies.
The headquarters of the S.O.C.E. is also located here.
Its name originated from the fact that it was the fifth
planetary capital of the Galaxy Federation.
I think it's safe to assume that Xenosaga's universe has gone to shit. Repeatedly and on a massive scale.
I'm not sure about any spiritual crises, but there is a marked increase in Gnosis numbers, so...