Shunsui Kyōraku is the one who takes the lead in the current timeline. After the whole mess with the Soul King, Yhwach, and the 'Thousand-Year Blood War' arc in 'Bleach', Genryūsai Shigekuni Yamamoto — the ancient Captain-Commander — is gone, and Shunsui, who used to be captain of the 8th Division, steps up as Captain-Commander. I love how that move felt both inevitable and oddly fitting: Shunsui’s laid-back, tea-drinking persona hides a cunning strategist and a captain whose ideals about freedom and the shape of society make him a good fit to try to steer the Gotei 13 in calmer seas. The manga makes that transition fairly clear, and the novel 'Can't Fear Your Own World' and the epilogue scenes reinforce that he’s the one holding the reins post-war.
If you binge the 'Thousand-Year Blood War' arc like I did (late-night read with cold coffee, anyone?), you see the logic: the old guard—Yamamoto—is history, several captains die or are wounded, and Shunsui naturally emerges as the person Soul Society trusts to patch things back together. He’s different from Yamamoto’s iron-fist approach; he’s the kind who listens, delegates, and uses soft power when he can. That leads to interesting dynamics: people like Ichigo still become central to the world’s balance, but they don’t lead the Gotei 13 itself. Fans sometimes speculate wildly — “Will Ichigo take over?” or “What if Urahara returns and disrupts everything?” — but canonically the leadership role of Captain-Commander belongs to Shunsui in the post-war timeline.
I’ll admit I get a little sentimental about it. Shunsui as commander brings a vibe shift: less rigid, more human, more fallible — which makes for better stories if Kubo ever decides to revisit the setting. If you’re trying to catch up, re-read the final chapters of 'Bleach' and skim 'Can't Fear Your Own World' for context; the transition and its aftermath are spelled out across those works. Anyway, I enjoy thinking about how a tea-sipping trickster now has to run a military institution — it’s such a delicious clash of character and duty.