I've never seen him/it
Je ne l'ai jamais vu dans cet état.
I've never seen him like this.
Non, je ne l'ai jamais vu avant.
No, I've never seen it before.
But I've never seen him.
I've never seen him do it.
Je ne l'ai jamais vu dans le coin.
I've never seen him around here.
Je ne l'ai jamais vu auparavant.
I've never seen it before.
Je ne l'ai jamais vu avec personne.
I've never seen him with anyone.