I would be lying if I didn't say Naruto was a huge inspiration for me to start trying to emulate anime and manga. In fact, it may have been the sole reason I ever attempted it in the first place.
Something about the "cleanness" and use of simple blacks and whites in Kishimoto's art was very appealing to me and I really felt like I could emulate it!
However, on the more complex end, I would say Hiro Mashima's under-appreciated gem, Rave Master (or Groove Adventure Rave) was a HUGE inspiration to me.
The way he illustrates action, his penchant for bizarre Toriyama-esque chapter art featuring crazy outfits and locales, the bizarre faces and creatures, THE SWORDS, and how could one forget DEM CURVES??
Speaking of Toriyama, his character style never really rubbed off on me... at least, not to my knowledge... but something about his LANDSCAPES! His settings just seem so ALIVE and vivid and imaginative! I just want to explore every single one!
Well...uh... I guess I'm in a minority there because I can't find an example on Google images to save my life.
I'd say Tite Kubo (Bleach), Yoshihiro Togashi (YuYu Hakusho), and Akira Amano (Katekyo Hitman Reborn) all helped filter in as well.
But a REALLY big manga influence has GOT to be Rumiko Takahashi. I saved her for last because she might be my biggest manga inspiration of all time. There's just something soft and magical about her art, even the stuff she's not good at drawing. Her writing style, humor, and portrayal/emphasis on romance definitely inspired me as well.