I managed to finally put together a Rena Ryugu Figma. It's not completely accurate but I'm happy with the result. I bought a small Rena figure (from the daybreak series) and her hair piece fits perfectly with the Lucky Star figma's face and body. So I saved up some money and bought Tsukasa in her summer uniform which matches very well with Rena's school uniform. All except for the ribbon since it's suppose to be a tie. So as pictured it's Tsukasa's face but with Rena's hair piece which seems to go well with each other.