Brian Labone
A captain that led by example and also a great ambassador for the club off the field.
I know it was another era, but I imagine he would certainly have had a strong word in the ear of Lukaku, or anybody else who appeared to be 'dissing' the blues.
For likeableness Naismith in recent memory is up there. Not favourite by any stretch- but for pure likeability. Stracq, Carsley, Unsworth honourable mentions too.