 If you liked
Full Metal Panic!
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 ...then you might like
Shijou Saikyou no Deshi Kenichi
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Both shows have hilarious comedy in between action. Both shows feature a bit of a romance. The only thing FMP has more of is Drama. Kenichi has more comedy and ecchi moments than FMP.
Also the male VA for Sagara Souske does the voice of Shirahama Kenichi.
Both shows are really lots of fun, so check them out!