[Matrixbeast]

I kind of figured that most of the Horroscopes wouldn't be introduced in the series, or will simply be in a boat similar to the Heat, Luna, etc Dopants in Double, and be movie exclusives.

Obviously Aries Horoscope will make an appearance, and they've made it a point to show the Scorpio and Cancer Switches remaining on Earth when their Switchers were banished. We also have 20 episodes to establish the Virgo (Or Libra. Damn, I swap their names all the time) character.

Considering that each Zodiart gets a 2 episode arc (And the remaining Horoscopes have yet to be discovered), if they wanted to, they could get away with the remaining 7 at the expense of any real characterization whatsoever...
I expect to see Aries and maybe one more in the remaining episodes, in my opinion though. Kijima only lasted 6 episodes but quickly eclipsed the other Horoscopes as my favorite.