Honestly this is always a bit of a headache because we're kind of mixing canons here. Meliodas from 'The Seven Deadly Sins' has a kid, Tristan, in the sequel series 'Four Knights of the Apocalypse'. From what's shown so far, Tristan's power inheritance is messy, which tracks for a hybrid character. He doesn't get the full Demon King juice or the literal immortality curse. Instead, he manifests a twisted version of his dad's powers.
The big one is his own brand of Hellblaze, which he calls 'Dark Flame' or something similar. It's got that classic purple destructive energy, but it's patchy and unstable, especially when he's emotional. He also seems to have a massive, almost unnatural reservoir of magical power and physical strength compared to his peers, which is pure Meliodas heritage. Where it gets weird is the eyes—he can flip between his dad's demonic black markings and his mom's goddess aura, which gives him a wild, unpredictable power set. The story really leans into him struggling to control this dual legacy rather than just being handed a clean copy of Full Counter.
I'm more interested to see if he ever develops anything like his father's berserk state, but for now his inheritance is more about potential and conflict than a checklist of abilities.