Uhm Bangai-O Spirits for the DS should be self explanatory. Or if you can, get Bangai-o for the Dreamcast.
Bangai-o spirits trailer
http://www.youtube.com/watch?v=P7rErEhD-TM
Bangai-o dreamcast review
http://www.youtube.com/watch?v=s8cQEDXSTrA
Mech War games
Re: Mech War games
I almost forgot R.A.D by Enix for PS2 its kind of rare but a unique take on mech fighting.
Re: Mech War games
I've got that game, though forgot to mention it. It IS a quite unique game, and veery long.