"Sparky" doesn't want to work with her brother "Gary".
"Gary" doesn't want to work with his brother "Larry"
No problem with "Sparky" & "Larry".

"Hurl" will quit if you have "Fidel" in the team ( or, killed by
"Fidel" ). ( Uh, "Hurl" is a male, not a female. )

"Fox" will quit if you have too many casualties. She will come back
( after she quits ) if you improve your casuality situation.

"Wolf" can't stand you raise salary of any other people.

"Mike" & "Scully" are good friends. So do "Magic" & "Sidney". Any
one of them will quit if their buddy is killed or fired. ( ? about
the "good friends". See #66. )

"Biff" doesn't want to kill anybody. If he really kills a bad guy,
he will quit and say thing like, I want to go back to school. He
won't join if you have any guy get killed.

"Skitz" will kill "Sparky".

** "Reuben" will kill "Ivan"(!) and other people.
"Ivan" will try to kill "Reuben" too.
"Ivan", "Larry", "Bernie", and "Kelly" won't work with "Reuben".
( Maybe not really killing each other. Check with the A.I.M. to
see whether they are still alive or not. I did get "Ivan" back
after I fire "Reuben", but I lost a bunch of M14 & .357 ammos
PLUS a modified M14! )

"Fidel", "Leech", "Reuben", and "Skitz" will refuse orders while in
the middle of a combat. You will need to either deal with this
personality or use the tricks.
( Maybe there are more mercs will refuse order like them, but not
all of the mercs had been tested. )

"Kaboom", "Larry", "Moses", and "Pops" have AMNESIA.
( This seems to be the personality of these guys. Has nothing to do
with their "Wisdom". I once tried to raise Kaboom's "Wisdom" to
100 via editor, but he STILL forgot the order! )

When you fire "Vinny", then hire "Magic" & "Scully", "Scully"
will ask for double salary because "Vinny" said something to him.
( This looks like determined by Randomness. See #66. )

** Someone said if you fire "Tex", he will say bad things to many(!)
people in A.I.M.

"Ice" will quit if you fire too many mercenaries ( including the
replacement, the turnover rate ). He won't allow you to fire people
after they worked for you just one day.

When a merc does not want to work for you ( QUIT situation ), you
will need to increase their salary 50% to keep them. ( 50% is the
salary for another exp. level. )

"Len" will only work for you if your turnover rate is below 20 or
less.

"Static" gets bored if nobody of your team dies or gets fired.

"Mike" won't work for you if your turnover rate is too high ( over
30% ).

"Weasel" won't work with "Ears".

"Raffi" won't work with "Doc".

"Cliff" won't work with "Raffi".

"Jimmy" won't work with "Lynx".

"Sam" won't work for you if you have "Ivan".

"Magic" won't join if you have "Kaboom".

"Screw" don't like "Bob".

"Hector" don't want to work with "Smoke".
"Lynx" don't want to work with "Smoke".

"Magic" will work for you if your overall performance is over
40%. Same for "Static".

"Mike" will only work for you if your overall performance is 100%.

"Scully" and some other high marksmanship mercs ( "Hitman", "Kelly",
"Spike", "Lynx", etc. ) will only work for you when your overall
performance is over 60-70%.

"Fox" and "Smoke" will join on day 2.
"Leech" will join after 3-4 days.
"Sidney" will join after about one week.
"Vicki" will join on day 15.

The following could be determined by Randomness:

"Ice" won't work for you if "Hector" is fired or buried in the river.

"Ice" or "Magic" is also touchy about "Fidel" getting fired without
reason. ( Probably not "Magic". )

"Turtle" and "Bob" won't work for you if you fire "Gary".

"Bernie" won't work for you if you fire "Reuban"(?!).