This is a backstory I never really used: you might use parts of it as a starting point.
The limitations on the character are:
Can never add to Magicka
Cannot learn new spells or use any Magic perks
Can only add to Stamina ⅕ of leveling occasions
Can only use daggers and bows. No swords, axes, maces, shields or staffs
Can use enchanted items if found or purchased. Can use Soul Gems to recharge.
Can only use light armor
Can use Standing Stones
In order to come up with a way to get my character to take on his self-assigned goal, I had to abuse the game mechanics. There has to be a reason for him to ask about rumors, since this is the only way that the game allows him to enter the Dark Brotherhood, and assassinate the emperor.
My name is Ha’adeeth, a Crown of the Na-Totambu. My family claims direct descent from the ancient king, though we have fallen on hard times and for decades we have lived on the edges of the Alik’r desert, eking out an existence and shunning all except a few other similar families. My grandfather still rules the family and refuses to accept any compromises with the Ra-Gada or any outsiders, indeed he expects us to speak Yoku and he will not (maybe cannot) talk to those who speak other languages. His hatred of the Ra-Gada is exceeded only by that for the Emperor, and I believe he would even work with the Thalmor if it would harm his enemies.
I have always been an embarrassment to my father and grandfather. Unlike my six elder brothers, all of whom revel in battle and all forms of physical hardship, I am weak and uncoordinated (in truth even my sisters are more capable than I). Despite almost daily sessions with the battlemasters I still so puny that I cannot wield even a sword or axe, nor hold a shield, for more than a few minutes, so I am reduced to using daggers. My archery skills are also limited, though I can at least hit a target more often than not. This was all bad enough, and guaranteed that I would never be accepted as a full part of the family, but there was worse to come. Given my physical limitations, my father decided that I should be given training as a mage. In itself this was an extraordinary decision, given our distrust of all forms of magic, and a further sign of my grandfather’s desperation. It didn’t take long to discover that I was incapable of memorizing many of the key spells: I constantly reversed key elements and could not seem to even use scrolls or recipes properly as I kept misreading the information (sometimes with disastrous results). Even then I might have persevered and become proficient enough to earn a living but, as I matured, it became clear I was a witling. Unable to gain any further Magicka, I was doomed to a lifetime of being able to cast maybe one simple spell before exhausting my pool, then waiting many minutes while it replenished.
With no serviceable skills, I had nothing to offer the family and could see nothing that would allow me to make my way in the world. In an effort to force me into a choice, my father gave me increasingly demeaning tasks, women’s work, and acting as a servant to my brothers. Each night I would lie awake, racking my brains for a solution, no matter how desperate, and then slowly, and with a sense of disbelief, I came up with an idea that would not only make me worthy in my family’s eyes, but would perform a great service to all of Hammerfell: I would assassinate the Emperor!
Clearly, in many ways I seemed to be the least-likely candidate imaginable, but I began to see my drawbacks as potential positives. Who would suspect someone like me? My clear ineptitude might cause the Emperor’s guards to relax their security, giving me a chance. After all, storming the palace with a battle-ax wasn’t the only way to kill. The more I thought about it, the more I convinced myself that this was my only chance to redeem myself with the family, so I finally broached the idea with my father while he was drinking after dinner. Not surprisingly his reaction was to laugh so hard that mead shot out of his nose, and then he called in the family to tell them what I had proposed. The next half hour was humiliating, as each of my brothers found increasingly insulting scenarios of failure, culminating in my tripping over the emperor’s chamberpot and getting drenched with the contents.
I had noticed that my grandfather stayed silent throughout the entire proceeding, and assumed he was so disgusted that he had nothing to say. So, it was to my complete surprise that he held up his war ax, a signal that he was about to make a formal family pronouncement. ‘While I think the idea will never work, it is Ha’adeeth’s choice to make. Better he die in a task as valiant as this, than live out his life as he is now. And, if by the luck of the gods he should succeed, the honor he will bring to us would be immense.’ He stopped, and there was complete silence around the room. No one was willing to argue even though it was clear none of them agreed with him. He waited and then dismissed the rest of the family, motioning me to stay behind and sit in the chair next to him.
‘I doubt if you will even get close enough to even see the emperor’ he said. ‘Still, there are a few things that might help, including your own thought about being seen as no threat. One thing I can help you with, and this will stay between the two of us: I have an old friend that might be able to help you. He owes me a favor since I hid him after he killed his father. His name is Nazir. I don’t know where he is living, but I do know that he is in Skyrim and he will be at a specific location on the first day of each month. I will also send him a written an explanation of your plan (It is in Yoku, which will convince him of the story and be safe even if captured by Imperials), so he will know what to do to help you, but don’t expect too much, he was acting very strangely, he kept talking about his brothers, which is odd since he only had sisters. Wait at least a month for him to get the message, then enter Skyrim, go to the Bannered Mare in Whiterun and look for him. If he is not there he will leave a message with the innkeeper (just ask if there are any rumors). The message you get may not make much sense, but follow the directions and they should lead you to him. If not, ask again. May the Gods protect you, but I doubt if we will see each other again.’