I guess today is kind of sort of like their birthday? That's kind of cute.
Admittedly, I never got into Splatoon (not big into shooters... exceptions do exist). I enjoy the music and have more remixes of it on my playlist than one who dislikes the series probably oughta to (I have a bad habit of buying music from games without playing the games first) but I did love the contrast of pointy design paired with round design and believing that someone blurted out, "We NEED to add a beeg fish to the group!" The one thing about Splatoon's overall design I have never been a fan of is the large heads and hands on comparatively small bodies, but that carries over into most media. It's definitely not just a Splatoon thing.