meaning and function of だの I tried to translate the sentence: > **** My try: > In this world, I am called a game junkie, which is to say “hikikomori” for such people like me Is the similar to ? is there a relation between (earlier in the sentence) and ?

I think you are parsing this sentence incorrectly. The basic structure is:

> AB
> call A (as) B

where A = and B = **** ****.

For the meaning of (note that there are two of them but you only highlighted one as causing you problems) see this post.

Overall translation:

> Society calls people like me things like shut-ins and game junkies.

I'm using your translation of game junkie because I honestly have no idea how to translate .