I personally don’t get mad at characters getting or not getting into crossovers; at the end of the day, it’s a video game, and the roster choices are completely out of my control. Getting mad over it is only going to cause me mental negativity, which is something I want to avoid. For example, I wasn’t really excited for Byleth getting into Smash Bros back in 2019, but there were people who wanted that character, so I congratulated them and then moved on. Then, I tried the character when it came out to see if I liked them or not, and I ended up liking him—he’s one of my secondaries, actually (lol).
My most wanted characters are Ratchet and Clank, Lloyd from Tales of Symphonia, and Seth from Bravely Default 2. They’re extremely unlikely, but it’s not the end of the world if they don’t get into Smash 6. The rest of the newcomers they add could be fun to play, even if I’m not as familiar with most of them.
This is my personal opinion, of course. It’s valid to feel disappointed or sad for a character, specially one that you’ve been waiting for a long time, like Golden Sun fans.