They might be in Japanese. I don't know. To me it looks like Space Invaders but I don't think that's a real language.
Update - I just found this:
UPDATE: In the comments I found this:
Alright, this is the closest I could get to translating the 3rd message to Ken. I'm not fluent, but this is as close as I could get. Was this in reply to a specific Ken tweet? It's like a little song to encourage Ken to go on. It's strange because he writes out the english word "fight" in japanese. Someone who knows more about japanese than me, feel free to correct me with a better translation! :)
Good morning, Ken! *music note, happy face* (Kanji I don't know) Make money, fight! *music note* Go towards the fight! *music note* Somehow, you love and you fight!
I love the Ken Plume "Love and Fight Song". I just tweeted it to Ken: