ok so he is a Magus, that is using the black blade archetype and the kensai archetype.
Essentially wanting to use the Estoc as the black blade and the kensai abilities in addition to being a drow noble for race with Xian region traits. Armor wise using a Haramaki which gives a +1 AC while not giving a arcane spell failure or armor check penalty, but with canny defense able to add intelligence to Dex for the purpose of additional defense. Its a very smart build... but the rest of the crew will not be able to compete on levels I believe beyond 4 as their ideas are fairly simple.
So ok, I am letting him be a drow noble but he is going to be a level behind everyone else as I think its a +1 level adjustment.
The other characters are essentially.
Ratfolk alchemist no archetype or anything
human barbarian no archtype
and there was talk about a human monk and human paladin again with no archetypes.
Allowing him to be a noble drow is a questionable choice.A kensai that get
+4 Dexterity, +2 Intelligence, +2 Wisdom, +2 Charisma, –2 Constitution.
is getting a large boost.
We are speaking of +2 to hit, +3 to AC, +1 to will saves, +1 arcane pool point.
The -2 to constitution can be ameliorated through magic items or feats and it is the same drawback a elf get.
As he is clearly meant to be a melee character and not a spellcaster the loss of 1 spellcasting level will not hurt him much, the -1 to hit a bit more, but it is compensated by the the +2 for the higher dexterity.
Essentially you are giving him a non standard race that boost his strong point while minimizing the cost. That can create problems within the group.