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`OOOOOOOOOOOOOOOOOOO and so on`

Game of Life and HighLife:

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`OOOOO OOOOO OOOOO and so on`

In Seeds (extend the diagonal):

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`O.....`

.O....

..O...

...O..

....O.

.....O

In Wolfram 22, Wolfram 60, Wolfram 90, Wolfram 102, B1/S12:

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`O`

In HighLife (thanks, Nathaniel), down below.

More examples coming soon!

Updated as of 07:38 UTC.