SO my son and I were talking about his soon to be tank in his room, and he asked about BFF fish that he saw on tv.
YouTube - My Best Fish Friend BFF Fish
YouTube - My Best Fish Friend BFF Fish
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The second fish were northobrancus these are what are called annual fish as they only live for about nine months. This is because they live on flood plains.
Another type of killi you could try is aphosemian ( dunno about the spelling) these are just as colourful and live for a few years although the females are a blander than the males.
If you need any help mail me kept and bred killi fish for years.