Omniscience – The ability to know anything and everything.
In Swamp Thing #62, Metron and Swamp Thing encounter an aleph and are temporarily omniscient. The graphic below was made by joining two pages and kept full size when uploaded. I think the graphic might make a good poster!
Doctor Doom (Marvel) struggles with omniscience in Secret Wars I.
The Leader (Marvel) discovers that too much knowledge can literally kill you in Tales to Astonish V1 #74.
The Phantom Stranger (DC) has near omniscience (Secret Origins V3 #10).
In Silver Surfer V3 #45, Thanos (Marvel) struggles with omniscience.
The omniscience of Thanos (Marvel) is illustrated in depth in Thanos Quest #2.
The Beyonder (Marvel) shares omniscience with his girlfriend Allison and she doesn’t like it in Secret Wars II #4.
Detective Chimp (DC) experiences omniscience in Helmet of Fate-Detective Chimp #1.
Mr. Majestic (Wildstorm) can become omniscient for a second.
Finn – 2000 AD #815
Firekind – 2000 AD #828
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