Mhrghm, I would call it the 'Alistair Affect', under these tenuous definitions:
- He's a character that's initially awkward, nervous and shy, but can be propositioned for romantic advances.
- He has some relation to the Templars, in whatever shape or form (whether hunted by, trained as etc).
- He has a shaved goatee, ginger-like (or blonde esque) brown hair and a quite square face.
- He's a character that's been through difficult hardship in their life, which itself can be conversed about.
To this note, it'd be interesting to make a poll on whether a person had previously romanced Alistair and if they now want to romance Cullen.
Also, it would appear Anders fits some of this criteria. Especially if one replaces the first line for a description of Alistair's humour (Anders in DAO:A).
- Yes, he was awkward in DA:O and it was painfully awful
Confident Cullen > Goofy Cullen
- Alistair wanted absolutely nothing to do with the Templars and didn't see himself as a religious person, didn't hate mages and wasn't a Templar
- 

I agree there are similarities
-Every character has been through difficult hardship in their life. Leliana, Sten, Zevran, Merrill, Fenris, Anders, Isabela, Shale, Oghren and Sebastian to name a few. Cullen's difficult hardship is very different from Alistair's.
Also, since Alistair was the only straight male LI in DA:O and LIs were limited in general that poll doesn't seem like it would offer any interesting information.