Art/Animattion
The overall look was well fitting for the series, every character was drawn well and because everyone had a different weapon their attacks had to be animated differintely, the animation was pretty good and did make use of a few still shots during a fight now and again.
Sound
The music used is good but it isn't great, the opening is a decent rock song and the music used during battles helps keep things going by adding tension or excitment, the sound effects are all ok, they make good uses of the sound of walls being destroyed and the waves in the ocean. Voice actors are all well cast, now i'm talking about the English dub because i never watch the Japanese version, the one's that stood out for me were Papillon, Moonface and Captain Bravo, these three stole the spotlight when on screen with their unique voices.
Characters
Kazaki Mutou the main protagonist is a very bland shounen character in my opinion, at the start he is given a speical power and decides he wants to use it to save everyone with zero sacrifices and this can get annoying but you will grow to like this guy, Tokiko is our second protagonist who can go from fighting mercilessly to getting embarresed when wearing a swin suit. Papillon is a unique antagonist in that he is very camp in the way he acts and dresses, he also has a Gauron type obsession with Kazuki. All the other mini antagonist and good guys all were unique people who you can never get bored of, and the main characters friends were all fun and added a comic effect at times.
Overall
Busou Renkin is an enjoyable shounen action series with a little romance added in there, it's sure to keep you interested with its wide range of original characters out main guy has to defeat or work with and is sure to please any fan of the genre.
