At first, I was thinking that it was just more Splatoon material, only to see the emblem as well as the silhouettes of all the fighters, so I knew it was coming.
Considering that they were cut last time for technical difficulties on the 3DS, I wasn't terribly shocked to see them return. But I was glad.
It took me a while to understand what I was seeing, and was a little excited to see him back along with Squirtle or Ivysaur.
I didn't recognize who he was right away, but when I saw the banner, "Everyone is here!" I actually got a little excited, even though we already knew about half the cut veterans from the previous game returning, and I already got what I wanted--the return of Sonic and Cloud.
I didn't mind all that much, actually. We knew that echo fighters are directly based off their original counterparts and control exactly the same way, with very slight tweaks to help differentiate them from their counterparts (for example, Lucina with her lack of tipper; and Dark Pit with a different Final Smash). For example, it looks like Daisy's hitboxes are going to be a tad different from Peach, if the rainbows vs. flowers thing is any indication.
Even though I'm not knee deep into the Metroid franchise, I knew without hesitation when I saw that trailer that it was gonna be Ridley. And I'm happy to see him in there too.
Btw, I added in Ice Climbers, Pokémon Trainer, and Snake because they were cut veterans heading into 3DS and Wii U. I didn't bother mentioning Wolf, Pichu or Young Link because even though I was glad to see them back, I already knew they would be back.