The Time Rift (aka time gap) is where all the characters in Castlevania: Judgment are trapped in. In order to escape, one of them must defeat the Time Reaper. This phenomenon does not repect the normal passage of time, and so allows individuals from different time periods to be in it at the same time, such as:

Sypha Belnades from a time before Castlevania III: Dracula's Curse

Trevor Belmont and Grant Danasty from a time after Castlevania III: Dracula's Curse (but before Curse of Darkness as mention in Trevor's ending.)

Simon Belmont from a year after Castlevania

Maria Renard from two years before Symphony of the Night (three years after Rondo of Blood)

Shanoa from during Castlevania: Order of Ecclesia

Carmilla most likely before Circle of the Moon

Death from a time after Symphony of the Night and perhaps just before Legacy of Darkness

Cornell just before Castlevania: Legacy of Darkness

Alucard from a time after Symphony of the Night after the Alucard Spear had been passed to the Lecarde family, but before it passed to Eric Lecarde

Eric Lecarde from ten years before Castlevania: Bloodlines

Golem from an unknown period after Carmilla entered the timerift

Dracula from a time of his resurrection after Bloodlines, perhaps before the Battle of 1999 (but no earlier than Symphony of the Night, as he mentioned that the last time he fought Alucard, he wasn't at full strength, as he was prematurely awakened).

Time Reaper from 10,000 years in the future, the general time period of the Kid Dracula games

Against certain individuals, the Time Rift has side-effects, in Cornell's case, it locks him in beast form, in Golem's case, it gives him self-awareness, both returned to normal once they left the Time Rift back to their respective time periods.

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