I have actually experienced a lot of lovely true blondes in Tokyo mostly via tinder/bumble etc... or through the bar scenes. Below are the various categories I have encountered
1) the expat girls living here late twenties to mid thirties working for short/mid stints in big multi nationals and basically looking for any decent fella who's not got severe yellow fever (tinder and bars)
2) travelling tourists and business travelers who are on vacay mode and basically want a nice guy to show them around Tokyo for a night or three of fun (mostly tinder)
3) English teachers who are again here in Tokyo and willing to put out for a guy who's decent and goes about it in a good way.
I have seen many weebs etc but never managed to bang them nor have the interest as they have a completely different preference of their own which I definitely do not fall into.
At the end, there are several factors which you need to account for
1) I am in my mid thirties so obviously finding girls in that age range is easier since you have more topics to relate to. At your age things are trickier as most of these blonde girls from western countries have a strong sense of independence and may look at attributes other than just money.
2) you definitely need to stay in good shape and be able to stand out in social situations and be willing to take initiatives. It's ridiculous how many beautiful blonde girls iv approached initially scared but it turns out that they have been waiting all night for anyone to summon the courage to have a chat with them.
3) being financially well of or atleast a stable and progressive career and giving that vibe helps alot as even though they are not interested in your money, they do want a guy who can take care of them and pamper them as well as not be a liability
All of the above are moot points ofcourse if you are an Adonis 6ft + chiseled face dude which I definitely am not. Then it's a matter of just looking and smiling