The manifestations you will likely experience vary depending on the spirit companion. Visually, you will typically see orbs, light streaks, Shades, mist, and blurry apparitions. Audibly, you will typically hear words in known and unknown languages, specific sounds, along with random noises. It is also common to encounter manifestations of true form through dreams while sleeping or through visions while meditating. It is possible for you to experience any or all of these manifestations in any combination.
While some spirit companions share common manifestations, they each decide for themselves how they will manifest to their Keeper. Most often, a spirit companion will choose to manifest in a way that is comfortable and recognizable to their Keeper which fosters a great bond and greater chance of interaction.