Unusually for its species, my Tauros is docile by nature, and likes to nod off. Most of my Pokémon have personalities that match their Pokédex entries, but I think having a divergent Pokémon is cool too. Bulls are pretty badass, and in-universe Tauros would probably be my mount of choice.
I like to imagine that interacting with Tauros outside of battles tends to go down like this:
https://www.youtube.com/watch?v=XIphw6SsKC8 