Same! I literally just finished collecting the Slumber Party line, which now makes my Mermaze Mermaidz collection complete! I would've adored the Sirenz had they been released, and it makes me sad that we'll never get them. The show was alright, it just ended on a cliff hanger and didn't really answer any questions or properly flesh out their world either. And there were a handful of characters that didn't even get dolls made, despite appearing in the show. The unarticulated tails with weird designs didn't help them AT ALL! Imagine them with tails designed with actual themes behind them (like Shark 🦈, dolphin 🐬, seal 🦭, or various tropical coral reef fish 🐠), and give them proper articulation. BOOM 💥 instant success! Or MGA could've made them Fairiez 🧚🏾‍♀️and gave them Victoria Secret/Winx type removable wings, while still keeping the gorgeous faces and high quality clothing. I agree with you about giving them various face molds too, like using the RH/SH molds but scale them down to fit the Mermaze Mermaidz head size. I just feel like they really could've done SO much better had MGA put forth more effort and faith in them!

@brittneycofey8753 There was so much missed potential, what a shame! So many cool themes like you said, we'll never see. Now that the Slumber series is out I have some more to collect, but I've been focusing on My Pretty Mermaids lately so must get back to finish the MM set 🥰