My group is switching gears.  Currently I am the DM.  Someone will be taking over for me in a new campaign so I can create a character and get to play.  Due to these last several months, I have become obsessed with Kobolds.  One of my players had a ring that was able to control (or rather become the leader of) a Kobold tribe.  Needless to say, it was hilarious.  RPing kobolds makes my day and I would love to roll a character.  However, I have been informed by my DM that Kobolds are nearly impossible to play because if you walk into a tavern or anywhere with people, they'll just kill you on the spot.  So, I came up with this...

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I will be attempting to play a Kobold Warlock, Lawful Evil.  Emphasis on the "L".  One day a celestial being approached a lonely Kobold and offered to make a Pact with him (for no reason known to the Kobold).  The Kobold, seeing an immensely powerful being, quickly agreed for fear of the being's wrath.  Upon completion of the pact he received a magical (celestial) tome.  Over time, possibly due to the influence of the celestial, this Kobold began to grow a conscience.  He began considering what was right and what was wrong on a whole new level.  He began to question the tribe's way of life, which led to his eventual banishment from the tribe.

The lonely Kobold wandered, moving from place to place when he was able.  He tried to join other beast-like tribes, but no one wants a Kobold.  He even came close to being eaten a time or two.  The kobold eventually winds up in a city of men (and other races).  Again, he learns quickly that no one wants a Kobold around.  So he learns Mask of Many Faces as a warlock incantation and permanently uses it to pass himself off as a Halfling and takes the name Larry.  Being a Kobold and a bit shady by nature, he finds himself under the employ of a more upscale brothel.  He starts work as a waiter, eventually being promoted to courier.  It was not long before he was being directly recruited by the local crime organization.  At long last, Larry had found a new tribe (crime family).

His talents were quickly exploited.  Larry had a knack for tinkering, particularly trap-smithing.  He was put in charge of a (very) small temple as the head cleric.  There he was accept "donations" from the local populace and businesses for "protection" granted by his "god."  On the side, the organization would occasionally call on him to "fix" things with his particular skill-set.  For a while, life was good.  (Yes, that was a lot of parenthesis)

Eventually the city watch wised up to the going-on's of the temple.  The crime family wanting to quickly cut ties, or be implicated, and threw Larry to the wolves as a scapegoat.  He narrowly escaped with his life.  Betrayed by his tribe once more, Larry makes to flee.  This is around the time he meets our adventuring party.  He declares to himself that his best chances are with the new adventurers, hiring himself out as a cleric (LvL. 2).  With his Celestial patronage, he is able to fake being a cleric very well.

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He has a high charisma score and is a very good face for the party (Persuasion, Intimidation, Deception, Insight).  While he is technically Lawful Evil, all he yearns for is to be a part of something bigger than himself.  Another tribe.  Once he finds a group to be loyal to, he is immovable in his commitment to them.  You can almost consider him to be the anti-hero.  Because of this, he can easily slip into most any good aligned party.  He genuinely wants to help his party in any way he can.  Up to and including the dirty work.  He is willing to do the things the other party members can't or won't do, whether they agree with his actions or not.  His words and actions are typically ruthless as long as the ends justify the means.  He is a Kobold, after all.  He can also be a bit greedy.  It is not wise to leave shiny things out and about.

tl;dr

So, that is the idea.  A Kobold Warlock (LE), passing himself off as a Halfling Cleric.  Only the DM will know unless the players find out by other means, which is entirely possible.  But I hope to keep that he is a Kobold under wraps for as long as I possibly can.

 EDIT:  Some grammar stuffz

I'd rather see your kobold hiding behind a rather thick and dark cloak. No one can pierce the veil except maybe they see his eyes and the makings of a snout.

Close to his party, and diminutive in stature. He goes largely unnoticed. And perhaps enhances this with acting or stealth abilities. 

Going false cleric seems to take away the roleplaying point of being a kobold?

Maybe he is inspired by a dragon to be more than a chaotic wretch?

I like it. I recently did a very similar thing with an Aaracokra that spent her time pretending to be a human with mask of many faces (Abnormal races are frowned upon in the city). The moment was great, when, after quite a few sessions another player was falling from a great height, she dropped her disguise, sprouted her wings and flew up to break his fall, everyone around the table loved it.