Stellerdramon (The Blue one) and Photondramon (The Red one), both nigh invincible Super Ultimate Digimon, will serve as the next mascots to the sequels of B/C. However, there is a twist, in that they are not the direct mascots despite being the same levels as Brondramon and Cobaldramon. The Trio Master is not a separate Digimon either like Jadedramon was, but actually the DNA Digivolved form of Stellerdramon and Photondramon. To tell you the truth, these are not the first ideas that came to mind to next gen successors to Brondramon and Cobaldramon. The first two was actually a Plant and an Insectoid Digimon, but I've been attempting to design successors ever since I first designed Brondramon and Cobaldramon. Eventually, I finally settled on Gemini based Metal Empire Digimon, with the fused form Fusiondramon being Sagittarius.
To tell you the truth, I've been technically trying to design successors to Brondramon and Cobaldramon ever since I designed them. These are not the first ideas for successors, but they ended up being my most favorite when I designed them.