Is kirby worth it
I am more of a ness main but I am really good at using kirby but I keep seeing kirby go to the very bottom of every tier list, I wanna know if using kirby is still worth it
If you are good at Kirby, use him. I know some people who kill with him. Tier lists really don't matter, if a player works for you, it works for you, any character can compete. If you get to a point with Kirby that you can't really improve any further and aren't at the skill level you want, you can always go back to Ness, but he's fun to play and you seem to want to try him, otherwise you wouldn't have made a post.
So if you want my opinion, go for it.
As for techical advantage:
His down special is deadly and highly spammable. His suck ability is incredibly annoying to deal with. He's fast. He has some dash attacks that work well for crowd controll. His hammer ability can do good damage if you can contact with it. His high number of jumps combined with his up special makes recoveries easy. At the end of the day, it's not the character that makes the win, but the player.
P.S. When I said any character can compete, I meant any character except Olimar and Wii Fitness Trainer.