I've noticed that a few of the PoT CD covers have animals. For example, on the cover of Ichi-Fuji, Ni-Taka, San-Nasu, there is the dorsal fin of a fish in the water and a bird in the sky.
Kaidou is holding a snake on the cover of his album, Hebi Gara.
We have Echizen and Karupin on 3 of CD covers: Cool E, Future, and Everything.
Kikumaru is using Daigorou as a pillow on his children's song CD cover.
Now we have some covers with characters being OOC. On the cover of Oishi Syuichirou ga Utau Douyou Mekyokushuu, there are some stuffed animals. I know it's a children's song CD, but Oishi in a clown costume is OOC. Kikumaru would have been more fit for a clown costume, but they didn't have him wearing that for his children's song CD cover. Captain Tezuka and Sanada on an elephant is also OOC. The last one might not be as OOC, but I still find it hard to imagine those two keeping fishtanks.