
Pictured above is the Congo Tetra. Below is a quote from Wikipedia on the species:
"A sparsely-planted tank is best, as they like to have plenty of room to swim. They are shy and timid fish, and can be sensitive to water quality, so frequent water changes are a must. Male Congo tetras have longer dorsal and caudal fins and are much brighter and more colorful than the females. Both sexes can be incredibly beautiful with strong lighting and dark substrate."
I also do like the Siamese Fighting Fish, which is also known as a betta. There is much more information on their behavior on Wikipedia since they are one of the most popular species.
"Male and female Bettas flare or "puff out" their gill covers (opercula) in order to appear more impressive, either to intimidate other rivals or as an act of courtship. Females and males will display horizontal bars (unless they are too light a colour for this to show) if stressed or frightened. Females often flare their gills at other females, especially when setting up a pecking order. Flirting fish behave similarly, with vertical instead of horizontal stripes indicating a willingness and readiness to breed. Bettas sometimes require a place to hide, even in the absence of threats. Bettas may set up a territory centred on a plant or rocky alcove, sometimes becoming highly possessive of it and aggressive toward trespassing rivals."
We could apply these moods in our animation as the story goes on to match Charlie. Also:
"A popular misconception is that wild bettas live in very small puddles, and thus are "happier" when kept in cramped conditions. In reality, like any other fish, bettas are healthier, more active and will often grow larger when they are kept in a roomy tank."
My concept of Charlie is quite similar to this.
The Siamese Fighting Fish come in nearly every colour, but also come in nearly every shape. There are dozens of combinations of fins and tails. I find the flowing ones more lyrical in nature.



