 If you liked
Grenadier: Hohoemi no Senshi
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 ...then you might like
Naruto: Shippuuden
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Grenadier has a very similar humour and art to early Shippuden. Of course the similarity is rooted in trends of its time (2004-2005). The style of narration is also similar. Grenadier has a bit more ecchi. Naruto has more world-building. Both have similar dynamics between protagonists and antagonists (good guys - bad guys). Honestly, Grenadier almost feels like a filler Naruto arc, but more lewd and with different characters.