Boss on your back 
Okay, I've searched a lot but I still can't find that tennis racket guy's name :( [the one at the bottom]... And I don't remember it from the anime considering I've just started watching Gintama :D...If you know it, please leave a comment and tell me so I can include his name on the tags section ^^
Edit: Thank you, spockmoo!!
Now I know the guy at the bottom is Sagaru Yamazaki ^^
Hope you like it ^^
