루

Not established by these lines

In relaxed speech the particle 로 'to, by, as' is often pronounced 루, and two lines here show it: 어디루 갈까요? for 어디로 'where shall we go?' and 하기루 for 하기로 'agreeing to do it'. Everything else is coincidence — 하루루 is a viewer's screen name, 1루 is first base in baseball, 니루 is another name. Too little to describe the habit with any confidence.

The examples below did not fully pin this one down — read them before relying on the entry above.