:lol But seriously, what do you think those two have in common? And will it be sufficient for Cecelyne to accept Lelouch?
Well, you asked how the interaction would go, and I do think that would be part of it. But here's a number of keywords from Cecelyne's Excellency...
patient,
amassing - Before Exalting, Lelouch spent a good deal of his time slowly gathering resources and planning to take down Britannia
capricious hypocrisy - Lelouch can forget his morals in some situations, doing blatantly hypocritical things. Especially true if you hurt someone he cares about. See how he reacted to Shirley's death...
reverence,
worship - People following Zero practically worship him because he makes...
terrifying and wondrous miracles,
sudden and
shocking - It's Zero's schtick.
insightful - I would say Lelouch is this.
prior planning and effort,
established plans - Lelouch tends to plan things out in advance. He can work on the fly, but he prefers to do things this way.
desires and failures,
give others what they want,
influence and ultimately own - Lelouch is giving the Black Knights what they want in that he's freeing Japan from Britannia, and doing so secures their almost absolute loyalty to him
amass or
jealously protect resources that are
directly useful - I'd say Lelouch does this. He views the world as an oversized chess board, so he values getting pieces, and he does not like the notion of anyone taking his most valuable pieces.
endure unrelentingly harsh conditions - socially more than physically, in that he has to constantly work to keep his identity hidden, and this is only becoming more true now that he's active. Also he has to deal with Milly every day! Though honestly this one might be a stretch.
punish - Lelouch wants to punish Britannia, and he certainly is out to punish anyone who fucks with those he cares about.
The main hangup is that Lelouch doesn't consciously believe the strong should rule the weak, or at least the notion disgusts him. That said, he could probably be made to recognize that intellectually it's the truth, as much as he might not like it, so the answer is to of course get enough power to make things fair because even if the strong rule the weak it doesn't mean they have to oppress the weak. So, basically, continue on as planned - take over, establish his rule, make the world a more gentle place, all of which is will be his right once he's proven he's the strongest of all.
In my quest, or in the background?
In the past, before the quest started. Not canonically part of either universe, but I'm taking a small bit of this character's ZnT history and altering it to fit the Code Geass universe. I'll PM you the info.