- Base-Breaking Character: Aika gets her fair share of scorn for being a typical flat-chested, violent Tsundere. However, many view her as a breath of fresh air for at least directing said violence at the genuinely perverted Twoearle instead of dishing out Unprovoked Pervert Payback toward her love interest. Her aggression has also earned her scorn in-universe.
- Ear Worm: The OP is catchy and cheery.
- So Bad, It's Good: If it wasn't for its utter ridiculousness, the twintail fetish, and the fact that the male protagonist can turn himself into a flat-chested twintailed girl, then the series would have been less enjoyable. Western fandom considered this series to be the "best bad anime" of Fall 2014 anime season. The campy premise certainly helped, as well as the fact that it doesn't take itself seriously at all.
- Unfortunate Character Design: Tail Red's chest has two white dots on the black area that looks like that's her nipples popping out of her clothes, but it's a bit too high to be the case.
- What an Idiot!: Tail Red finding herself unable to destroy a mannequin created by Foxguildy because of its twintails, which she claims have done nothing wrong. Which prompts Aika to save her as well as defeat Foxguildy.
YMMV / Gonna be the Twin-Tail!!