I walk away when people put no effort into reading character sheets other characters they interact with most of the time. For example, a few months ago I joined a 1x1 role play with someone on another site and after three days of messaging back and forth I realized they didn't even skim over it...
Some times I role play in the 'Over the Garden Wall' fandom. Even though its a small fandom we always have fun using original characters alongside cannon characters.
I started role playing on the Steven Universe Amino to build up one of my original characters. After that it became fun and less of a hassle to make more original characters so I did just that.
My favorite type of character to RP with are those who are more focused on a group effort when planning or attacking, but I dislike when characters distrust other characters without a cause.