Well, since the Japanese names for characters come out like 8-10 months before the English names, I get really accustomed to using them. I still say Kanata instead of Kelly, for example. For the main characters and Pokemon, I eventually get used to using their English names after some time, like how I'm just now starting to use Mime Jr. instead of Manene.
A lot of the English names are also pretty bland, with exceptions here and there like Solana. I pretty much alternate between the two languages' names, though, sometimes even in the same post!