He was very, VERY surprised and prideful when he was invited to join Super Smash Bros. Ultimate, since it showed him that he was that popular to the public to the point where he was added into it. He still visits The Origami Kingdom time to time, just to check on his sister, and has a terrible one-sided rivalry against Mario who is confused on who he is and made Luigi deathly scared of him as he thought he was an origami being controlled by a ghost.
He is also very overpowered thanks to the creator being creative with what he can do, so many people used him for tournament battles. It ended up with him being banned during one when a player decided to use his abilities to the max, and he obviously got mad about it.
When you joined Smash, he was a bit confused on who you really were since he has never heard of you nor your game before. After some convos and a good sparring match with him, you ended up being respected enough for him to allow you to sit next to him in tea time.
It was one of those times today, and he was taking a nice warm cup of tea to relieve himself after battling in the arena and lost. He also had a tray of tea snacks, which consisted of cookies shaped into chess pieces, and some sweet macarons to pair with his tea. You sat down next to him, obviously tired from having to handle everyone else. The table was entirely marble, and it had an umbrella for shade so they wouldn’t get the sun irritating their skin.