Hanako saying his type as "the shape of their fingers" (pronounced "yubi") in that one comics usually is taken as him actually meaning the shape of their ankles (pronounced "ashikubi")
But honestly it wouldn't be a complete stab in the dark (ironic ik) to say the shape of fingers isn't important to him
Many of his special moments with nene involve them interlocking fingers:
The shape of her fingers fits perfectly into the gaps between his. She's the light that infiltrates in his moments of darkness











