A slot for Kliff?

Finally pulled Kliff but with my luck I get -def so my build has to change completely. I was going to feed him a Takumi for close counter but at 24 def I don’t think it’s worth it. My other idea would be death blow but would that effect the calculations for his weapon? What other A slots would be viable for him (rather not boost his atk anymore to get most out of his weapon).