Aside from themselves, obviously. Izzy, to his credit, was entirely unsure of where he should go now. If John opted to go with the two female vampires, it would mean that they'd be more or less safe...as safe as anyone could be with three vampires roaming around.
"I have a matter to discuss with you, Father," he said gravely, "Might as well make meself useful." He nodded the Fox.
Then, he noticed someone else who might be helpful. "Hullo Professor," he said with a smile and a small bow.