This is the 7178th most frequent Swedish word.
ryuichi
The word "ryuichi" is not Swedish; it is typically a Japanese name.
Here, 'Ryuichi' functions as a proper noun, specifically the name of an individual being described.
Ryuichi är en mycket begåvad musiker.
Ryuichi is a very talented musician.
In this sentence, 'Ryuichi' is used as a subject in past tense narration, refering to the person encountered at the event.
Jag träffade Ryuichi igår på konserten.
I met Ryuichi yesterday at the concert.
'Ryuichi' is referenced as the topic of pronunciation, indicating the name itself under discussion.