I've sketched out a solar system for my science-fantasy setting. In the interest of hand-waving only when necessary, I'm reality checking my idea to see what needs to be tweaked or changed outright, so that it works.
Here's my system.
Glimmer: Is the first planet in the system a Gas-Dwarf. Its name comes from the fact that its atmospheric composition causes it to sparkle like a jewel in space.
Tempest: The second planet smaller than earth around the size of Venus. Pre Terraforming it was planet covered with steam storms. Extreamophiles were the only inhabitants. Post Terraforming it's a tropical paradise, covered with archipelagos.
Viridian: The third planet named for its green skies. A super-terrestrial world thrice the size of earth, however its low density give the planet only slightly higher gravity, about 1.2gs.
Tellus Alpha and Beta: The forth planet and its moon. Tellus-Alpha and Beta required minimal Terraforming. Tellus-Beta while refereed to as the moon, would better be described as a sister planet. As a result of their sizes and proximity Tellus-Alpha and Beta both experience massive tides.
Sojourn: The fifth planet so named because the gravitational influence of the sixth planet a Gas-giant perturbs the orbit, which gives the world long, cold, dark winters.
Regis: The sixth, so named because it is the largest planet in the system and its many satellites which are refereed to as vassals; of which twelve were deemed worth the effort of Terraforming. It is also the last planet of the inner system.
The Gulf: Lies between the Inner and Outer and planets. In is composed of five asteroid belts and a number of dwarf planets and planetoids. It is believed that a massive cataclysm in the early years of the system shattered the planets whose material now composes the belts.
Ember: The seventh planet in the system, a gas giant half the size of Regis. Its name comes from the fact that the planet faintly glows. Reactions deep with in the planet cause it radiate heat. The planet possess a number of moons, five of which were Terraformed; the heat that Ember gives off reduced the amount effort required for certain aspects of the Terraforming.
Aegis: The eighth and last planet in the system. Its name comes from its pre Terraforming appearance and orbital position. Do to the abundance of metallic elements in its thin atmosphere the planet seemed to gleam like polished armor. People thought of it as the guardian or protect of the system.
To the inquisitive minds: Self-replicating Biots played a part in the Terraforming of the planets. They remain active in the atmospheres of the outer planets, acting as heat insulators and lenses that amplify light.