Nope.

Dex's kid brother, his name escapes me right now.
Their coming to take me away, hee hee haw haw hoo hoo
----------------------
You cannot kill what you did not create
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No, the answer is not Omega.
And the answer is certainly not blank, ringman.
The mega man zero series?
The answer is obviously Nurse Joy.
Mega Man Juno...?
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Nope.
(Who is Nurse Joy???)
Nurse Joy is from the Pokémon anime...
I'll have to think this one through...
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Megaman. I agree with ringer.
^Died thinking that he was the lord of caocs when he is the lord of care bears.- Ringman
with corrections to spelling..
< died thinking he was lord of chaos when he is lord of the care bears. Ringman
‎"those who live by sword get shot by those who live by gun....who get imprisoned by those who live by the law...Who get killed by those who live by the sword."
GYAAAH!!! ITS A VICIOUS CYCLE!!!
Nope.
Dr. Hikari Yuichiro, aka Lan Hikari's father.
He's in a succession of ancestry to his father in the field of science, could be considered the second youngest (being of the generation previous to Lan's) and resembles his father (of the oldest generation), while being of another world than the original MegaMan timeline that involved robots rather than NetNavis.
If that ain't it, I think Imma need a series hint.
Edited by Morphman on December 4, 2009 at 14:31:25.
Nope. And the answer is something from the Original Series.
The Rock Monster seen in Rockman & Forte: Challenger from the Future? My reasoning on this one:
Though I'm part of tradition, in a succession of ancestry, - Considering the number of times that this guy comes back...
I am considered of another world, and quite different from the rest. - That game's enemies are from the future, which can be taken as another world.
In my family, I am the second youngest, resemble the oldest, - In the order of the game's releases, he's the second youngest next to the Twin Devils.
but my size is what really sets me apart from everyone. - He's TINY!
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If you got the answer this time, Doc, I'm giving up on riddles here as there's no winning against you and Arkane anymore. >.>
Interesting guess and explanation...but that's not it!
Nope.
I think I need to give you guys another passage.
Ahem.
Though I'm part of tradition, in a succession of ancestry,
I am considered of another world, and quite different from the rest.
In my family, I am the second youngest, resemble the oldest,
but my size is what really sets me apart from everyone.
Being almost the living incarnation of him, I have my master on the brain,
and only when my heart is broken, will we fight face to face.
I tend to get an appetite during our struggle, even if it means eating you,
but please don't feed me hot foods, as they make me kind of sick.
Hahaha, the Mega Man 4 (GB) final boss?
I can't match the first passage with him, but the second one is a direct hit!
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