Others, like Leliana, are more prominent permanent members of the Inquisition. Alistair, for example, will take up the role of Hawke's Warden contact only if he was kept as a Grey Warden in the ending of Dragon Age: Origins as opposed to being made king. In some cases, the role of different companions varies significantly depending on the world state as imported into Dragon Age: Inquisition.
However, Dragon Age 4 can, and arguably should, make up for his absence moving forward.
While players may encounter references to him in a couple war table missions, he doesn't even make a physical appearance. Notably, however, the remaining romance option, Zevran, was excluded. In particular, three of the romance options from Dragon Age: Origins - Morrigan, Leliana, and Alistair - had significant parts to play in Inquisition's main questline. The release of Dragon Age: Inquisition saw the return of several notable characters from Origins, ranging in small roles to major story influences.