There's a lot of characters I like but here's my fav ones:
0) Mr. 3
1) Edward Newgate: Aside from being a powerhouse, WB had a moral compass and flaws. He was always aware of his own mortality and was a true family man. He taught many lessons about inheritance, just like Roger, about how everyone is a child of the sea (a newborn child carries no sin), and why you should not hold resentment for the past. I absolutely love all his designs, his legendary death and legacy, and the fact that he didn't actually overstay his welcome in the story.
2) Buggy: Originally, I thought he was just some two-bit, forgettable guy in the early days, but his subsequent appearances, relevancy, and accomplishments cemented my support. He'll become the pirate king and then the King of the World, if only for a few hours at least. He is also a genuinely funny guy overall.
3) Marshall D. Teach: Anyone who is not only the MC's foil but responsible for the vast majority of the events in the story is automatically going here. Amazing voice actor, acts like a true pirate should, holds no grudges, and plays dirty while believing in fate as opposed to destiny. We are not ready for him.
4) Garp: Oyaji of the MC always hits differently in Shounen, and I enjoy seeing him constantly struggle between family and duty. Taught us to live in the moment. He's been both beloved and controversial in the community over the years. I am pretty worried about his status with Blackbeard, but it is what it is.
5) Crocodile: Design, charisma, a desert king, voice actor, laugh. Best pre-TS villain, and I will die on that hill.
6) Doflamingo: Same as Crocodile but with that great backstory. Still the best villain of post-TS for me.
7) Kizaru: I love his demeanor, the voice actor, the drip, and the actor he's based on. I hope his story is properly resolved by the end of Egghead at least.
8) Usopp: I could relate to him a lot back in the day. He generated a lot of memes but was also serious at times. Goated pre-TS and still had moments in post-TS. Fingers crossed for Elbaf.
9) X Drake: His design, first ancient zoan reveal, and relation to Sir Francis Drake irl. He always stood out to me among the Supernovas back when he was introduced, and I loved how his past connected with Law's. Hopefully Oda will use him more in the story because Wano wasn't really it for him, sadly.
10) This one is interchangeable. It can be Luffy, Zoro, Sanji, Franky, Jimbei, etc.—really anyone, depending on how I feel. I like to keep it open.
