Most seme-ish seme that ever seme'd in seme history. xD!

[Miraxe]

Roxas.

xd Kidding.

Um, I don't know. sweatdrop I would say Yggdrasil (ToS), but then, Kratos and Yuan would come in. D: Hm. This is hard.

Envy from FMA? Well, it would make some sense. >>  

[Ootori Kyouya-sama]

Anyone else noticing that many of these guys are villans/antagonists? xd

Well, I'm dividing it into 4 categories:

Evil Seme:Muraki from Yami no Matsuei
Nice Seme:Hirofumi from Dear Myself
Behaviorally Seme: Kimbley from FMA
Not-Canonically-Gay-But-Would-Be-A-Seme Seme: Hijikata from Peacemaker  

[V e r i t y]

Xemnas
Mansex from KHII.
xDDDD heart

 

[Ootori Kyouya-sama]

(Don't you mean Mansex?)  

[V e r i t y]

Woops, struck out the wrong name.
xDDD Thanks for finding my
extreme typo. xDD"

*goes off to edit*

 

[Saiyana2]

ME!!! rofl  

[Alchemist_Wrath]

Saiyana2

ME!!! rofl

LMAO! That was hilarious...  

[tomb_robber_girl]

Eiri Yuki from Gravitation. Like, how ovious is that? Number one!

Muraki from Yami no Matsuei is semeish, but creepy o_o;;  

[Genica Pussywillow]

[Although it's not canon (To me, it's a little too close to be considered notXD) Fuuma from X]
[Or,
[Muraki (He's scaryXD)]  

[Morikami]

YUKI, YUKI, YUKI, YUKI, YUKI!!!!!!!!!!
MOTHING IS MORE SEME THAN THIS YUMMY YUMMY MAN HERE:
 

[[-Cadoan-]]

Itachi from Naruto
Muraki from Yami no Matsuei (I can't do anything else but loving him!) heart heart
Sephy! Sephy! At least in AC wink
Forcystus, Kvar and Yggdrasill fom ToS twisted
Roy from FMA whee
Xemnas/Ansem/Xehanort/Mansex from KH xd
Oro-san! Oro-san from Naruto is seme! whee
Legault from Fire Emblem 4laugh
Yeah, and Yuki from Gravi, of course! heart
Kadaj from FFVIIAC 3nodding
And Riku, but only in KHII... Okay, in KHI as well. I mean, the platinahaired is made for being seme's! blaugh