[quote=@Melkor]
"Seventh Eye: When activated, Alistair's eyes process information at a greatly increased rate. This makes everything around him seem much slower, allowing for him to fight more effectively with seemingly inhuman reaction time."
[/quote]

This can work. And seeing as he's British, he become a sword-using Sherlock Holmes.

[quote=@Melkor]
EDIT: Also, I forgot to address your other points; I was making the assumption that some major cities were decimated during the Second Genesis - I just thought I'd say that London was one of them. Also, I figured that since Tokyo is, to my understanding, overrun - why not make London in a similar way. Also, yes, he grew up in Japan. 
[/quote]

The problem with this is Second Genesis happened decades ago, meaning London would have been rebuilt by the current time. So unless it was overrun many times over, it wouldn't work. But if London was overrun over time or just deemed inhospitable, then sure this works.