Oh! Lonesome Me manifests mainly in Mountain Tim's ability to separate and spread himself along a rope. Tim's interior is darkened and not anatomically articulate.
Oh! Lonesome Me functions as an ability that Mountain Tim personally uses. It gives him and others greater flexibility in combat but is overshadowed by more powerful Stand abilities.
Oh! Lonesome Me enables Mountain Tim to separate segments of his or others' bodies and freely slide them along a rope. It also grants him superhuman control over the rope, freely and precisely manipulating it to grab small objects from afar for instance.
This ability to separate himself into little pieces as far as the rope goes grants Mountain Tim greater agility and flexibility. Launching himself along it, Tim may shoot enemies from odd angles; and through the process of splitting and joining himself and others back together, he may travel and escape through small spaces. By separating himself, Mountain Tim can also lessen the damage of a bomb blast.
Oh! Lonesome Me also allowed Tim to absorb water through the ropes as a means to survive the dehydration during his first time in the "Devil's Palm".