Hell yeah, his Slashing Blow to Omnislash V. 5 is one of the best combos in the game, especially since you can even do it from afar, by linking the two first blows of Climhazzard to a neutral dodge in the air and then Slashing Blow --> Omni xD
I like both of O.K BRV to HP combos, his Swordslasher is ultra fast yes, but I tend to use Holy to Flare most of the times, since the AI has a huge trouble dodging the lagging Holy orbs xD
My favourite BRV to HP combo in the game is actually Golbez, due to his Rise Wave -> Ambush System -> Cosmic Rays HP attack. Most people and the AI can easily dodge the Rise Wave, but since Ambush System comes out almost immediatly to the back and to the sides of the opponent, they are caught in mid-dodge by the Ambush System Rays, trapping them in place for Cosmic Rays xD
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"