That sounds like an interesting character you've created! It's always exciting to play around with alternate storylines and character development in fictional universes. Having your Spartan survive Reach and continue fighting against the Covenant adds an extra layer of depth to their journey. The color scheme you described for your Spartan's armor is a nice touch, representing the changes and adaptations that the character goes through over time. The dark blue color can symbolize resilience, strength, and a serious demeanor, while the light blue and cyan color during Halo 3 could indicate a temporary change in circumstances or mission focus. Overall, this allows your character to have a distinct visual identity while also showcasing their evolution and adaptability within the Halo franchise. It would be interesting to see how the changes in armor color coincide with major events or character arcs in your Spartan's story.