Before you ask, this is probably VRMMO, not isekai, but it's ambiguous. And they're just playing a game, they're not trapped in it. They can log out whenever they want.
After passing his entrance exams, he finally got to play Infinite Dendrogram. Mild-mannered but with a strong sense of justice, he'll throw himself into danger if need be. The Embryo that hatched from him took the form of a girl named Nemesis.
Nemesis Voice: Yuko Ono Ray's Embryo (Type: Maiden w/Arms).
She usually takes the form of a girl in a gothic dress, but can transform into a weapon at will. Contrary to her haughty, pompous facade, she actually scares quite easily. Also she's a tiny bit of a glutton.
Shu Starling Voice: Satoshi Hino Ray's beary important brother
He walks around in a full-body bear costume in Infinite Dendrogram because he accidentally made his avatar identical to his real-life self. This furry friend is a bit of a goofball, but he's invaluable to Ray.
Rook Holmes Voice: Makoto Koichi An insanely handsome young man.
He's a tactical genius in matters of observation and analysis. Despite his innocent nature, his in-game Job is "Pimp". He teams up with Ray as they're both newbies. His avatar is almost identical to his real self.
An air-headed succubus, her sexual powers are sealed away by the fact that Rook is a minor. Thus her seduction is limited to lap pillows and massages. Her food preferences are unholy, often combining sweets with spice.
Hugo Lesseps Voice: Ayumu Murase A "High Pilot" from the Dryfe Imperium.
He's quite the gentleman, with a strong sense of personal justice much like Ray. He cannot overlook foul deeds, even if they're in a foreign land, which is what leads him to joining Ray on a certain quest.
A snarky, sharp-tongued young girl who travels alongside Hugo. Her tracking abilities are quite high, and she's dependable in an emergency. Her body is pure white, and she prefers to eat food that is equally white.
Marie Adler Voice: Yoko Hikasa A player with the job of "Journalist"
She works for the Dendrogram Information Network (DIN). She doesn't like to mince words, and projects an all-business attitude even down to her attire. Even so, there's a lot about her shrouded in mystery...