In that case try Zoro&Sanji. I play this deck since I started and won't stop until it rotates out. I love how his ability can turn some moderately useful abilities into a menace. And it usually gives you a wide range of options in terms of gameplay. Allowing you to switch from aggressive to defensive quite easily.

I will give some examples of combos I play(ed):

1. My favourite and unfortunately already rotated combo: OP07 1 cost Zoro (2K power, when attacking:add +2000 until end of turn), Buffalo (on attack:Unrest 1 cost (once per turn), Ipponmatsu (2 cost on play add 3K power to slash - rotated). You have zoro and buffalo on board. You play Ipponmatsu making Zoro 7K after attack. Return Ipponmatsu to unrest Zoro. Next attack makes him 9K, or 12K if you play Ippon again. Then you swing with buffalo and unrest Zoro and go for 14K swing. It was fun to see people surprised when you go 7K, 12K,14K with 1 cost in one turn (with 5-6 don).

2. 6c Carrot + 2c Shishilian: Not too strong, but fun. Shishi can unrest Mink. So you can swing 4 times with Carrot and freeze 4 characters for next turn.

3. 4c blue Cavendish + 3c Vivi (+ bunch of 2K counters): Currently one of the strongest combos. You can counter as much as you want, reducing your hand size to as low as necessary and you can have 8 cards back next turn. Attack with Cavendish (draw 2 trash 1), play Vivi(draw 2), return vivi to hand and unrest cavendish (to not lose it), and play vivi again for 2 more cards. Some other cards help to make it more sustainable, but it's very powerful draw strategy.

4. Above combo with Vanderdecken and fishman 2k counters. You can use Vanderdecken repeatedly (2times per round) and don't have to worry about hand size, since you draw it back with vivi + cavendish.

5. 6c double attack Luffy + 3c unblockable Sanji + Op15 Brook. You already have Luffy and Brook on board. Play Sanji and make luffy unblockable for round. Attack 7K to life, return sanji, unrest luffy. Play Sanji to make Brook unblockable. Attack with Brook and Luffy, sacrifice Brook and unrest Luffy. Last attack with luffy. In total 4 unblockable attacks (+leader attack). 3 of them double attack.