The title is wrong.
What do the green bars under the little mini-title on the left mean? (between picture and name\mini-title)

It's your reputation on the board.

New members start off with minimal reputation.

Through good posts and contributing to the forum, other members can add to your reputation.

or you can beg for rep in its thread on general discussion, like everyone

The title is wrong.
What do the green bars under the little mini-title on the left mean? (between picture and name\mini-title)

The others have told you what the 'green bars' mean, however they did not tell you what Onion Kid meant. Onion Kid is the default title for all new members who join this forum. It's a final fantasy/8-bit theater reference.

They indicate how much you love Jolly Ranchers.

Onion Kid? How about JAFO for starters.