Young Talent Time had Maxi Mouse who would sometimes just come out and wave.
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There was Howie the Yowie at TNT9.
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Not really a mascot, but for a long time ATN7 had the cartoon kangaroo putting her joey to bed when the station would sign-off.
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Fat Cat and Friends used to air on Channel TEN Adelaide in 1972-1987. In 1988 it was moved to SEven Adelaide. This show was cancelled in 1991, however Fat Cat continued to appear on Channel Seven Perth as well as the mascot during Perth’s Telethon.
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My current avatar is the mascot for TV Asahi. 
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Paired together with Tommy Leonetti singing My City of Sydney with shots of the Sydney Opera House still under construction, they were really joint mascots I think.
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GMV6 originally had Joey the Clown in the 60s and early 70s (his alter ego Wally McQuaker died recently), and was superseded by Sam the puppet who was on the show “What’s Doing” with Kevin Loomes.
Youtube: telerecordings
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Imparja had Yamba the Honey Ant
Youtube: TVNUTS01
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TVT-6 and TNT-9 had Rupert Rabbit during the late 70’s and early 80’s.
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Also Yamba is still on tv NITV channel in QLD because every morning when I am in QLD for holidays I see yamba’s show on TB
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Before Big Dog NBN had Buttons The Cat
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To remind parents to put their children/child to bed??
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I’m sure parents don’t need reminding that it’s bed time for the kids
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