Wikipedia says Histeria was on Kids WB. I know Pokemon was on Kids WB also, but should have been on Fox at some point. Angela Anaconda was on Fox Kids. Two of a Kind was on ABC and Fox Family.
So, maybe it was a local affiliate like you're believing. I'm not familiar with local Houston channels.
I think you may be right about Pokémon airing on Fox Kids but not part of the main block as first 40 or so non banned episodes aired in syndication before moving to Kids WB.
Was this local affiliate station independent? As two of the shows aired on Kids WB at the time frame and the other two on the cable channel Fox Family (though Angela Anaconda did air on Fox Kids for a time in 2000).