The trailer introduces Master Detectives Halara Nightmare, Aphex Logan, Pucci Lavmin, Vivia Twilight, and Number One. The Japanese trailer also introduces Yakou Furio, but he is omitted from the English trailer for some reason.
Here is the official artwork for Number One, who is the only non-previously introduced character in the trailer:
Number One (voiced by SungWon Cho in English, Akira Kamiya in Japanese)
Title: Number One of the WDO
Master Detective Archives: RAIN CODE is due out for Switch on June 30.
Watch the trailer below. If you missed the first trailer, watch it here.
Characters Trailer: World Detective Organization Part 2
