[@Turboshitter]
While parameter increase is indeed a thing from regional boosts, it's been mentioned that the advantage gained can come in other forms. 
[quote]
The meaning of "strong" here is the Servant becoming closer to the strength, equipment of that of the legend. Through this blessing, the addition of another NP is also possible.
If Chu Chulainn had been summoned in his homeland Ireland, a castle, chariot, protection of sleeplessness, and the like would have been added probably. Also, if the magic energy of the Master is powerful, the Servant will become closer to his strength as in the legend.[/quote]Additional Noble Phantasms and Skills is one way that the regional boost can be utilized, though it would require input from the maker. Still, you're the GM so I won't tell you to alter the rules (since that would mean breaking the standard limit on NPs and Skills set within the RP) unless you feel it's fitting. 

[@vancexentan] 
Sorry, quoted you as a response since you were the one who posted the information. I didn't actually know it was your character. 

EDIT: I should also note, that it specifies an increase in strength towards that of the legend, rather than a general increase. Meaning, for example, a character who is already displaying strength equivalent to that of their legend would not have that parameter increased, but likely another that stems from lesser-known legends concerning the hero.