Maybe something great happened to him, like achieving a long-desired goal or getting a wonderful surprise.
Perhaps Bud had a moment of personal growth or connection with someone that filled him with excitement at the story's end.
It could be that Bud found a solution to a big problem he was facing or received some positive news that made him excited.
Well, in the end of 'Bud, Not Buddy', Bud was able to connect with his roots and find a place where he truly felt loved and accepted. There were some touching moments and surprises along the way that led to this satisfying conclusion.
Maybe they got some great news or had a surprise party.
Maybe there wasn't a suitable cartoon role for her. Or it could be that the creators didn't have a plan to include her.
Maybe they saw something fun like a new toy or a funny show.
The manga man could be excited because a new volume of his favorite manga has come out. Or perhaps a character development has happened that he's really happy about.
The cartoon girl might be excited because she accomplished a difficult task or is about to have a fun party.
Maybe she got a great gift or had some good news.
Maybe he got some great news or achieved a goal he set.
Cartoon girls might be excited because they received a gift they've been wanting for a long time. Or perhaps they're looking forward to a special event, like a school trip or a talent show.
The woman in the cartoon might be excited because she accomplished a difficult task or discovered something wonderful. There are many possible reasons for her excitement.