Just need one that i can churn butter with.
Ease of use does matter too sometimes.
My strategy for picking a character goes like this
If game has a story mode
1) Play through story
2) Pick favorite character from story mode
3) play arcade a few times with that character to see if they click at all
4) if they stick, then go start learning more with them, if they dont click then pick next favorite and go back to arcade
This has worked well for me for finding characters I like that are fun to me. Landed on Noel first try in Blazblue, and Marie second try in persona (I couldnt play as Naoto)
If the game doesnt have a story mode, then I just pick based on arcade mode spamming. This usually takes me a few more tries, like landing on Chipp in guilty gear XX(before I started caring about story). This would be my recommendation for most people though, just play a few times through arcade mode with as many characters as you feel like until you find one you enjoy playing and stick with them. Learning fundamentals will come naturally regardless of what character you play, maybe slower then playing the standard expected character, but you will learn, and have more fun doing so.