How to describe an online game player and youtube watcher in a single word

gijutsu otaku looks like the nearest word thanks to Stuart’s input.

Wikipedia defines otaku as follows:

Otaku (Japanese: おたく, オタク, or ヲタク) is a Japanese term for people with consuming interests, particularly in anime and manga. Its contemporary use originated with a 1983 essay by Akio Nakamori in Manga Burikko. ... The definition of otaku subsequently became more complex, and numerous classifications of otaku emerged.

“a technological geek would be gijutsu otaku (技術オタク)”.

While some online dictionaries offer a definition of otaku, Merriam-Webster hasn't yet added it, but they do provide a comprehensive analysis of the term, finishing with the following:

There remains a certain amount of disagreement on the meaning and politeness of otaku, which is hardly surprising when one considers that many of the people who self-define with this word are strongly interested in genres and highly particular fields of popular culture. When it's used in English, some view it as being rightfully applied to those whose interests are exclusively concerned with pop culture, while others expand it to include technology. Some feel that otaku carries the sense of “reclusive and potentially dangerous,” while others think it could mean “mostly harmless and quirky.”