I haven't played any RPG Maker games in quite a while so it's hard to remember the ones that had interesting combat (even if they failed at something else). There are a couple that stick out in memory though. Bounty Hunter 2 &
3 by T-ENTA-P have a gun shooting mechanic instead of the usual turn-based.
Dungeons and Prisoners (Abandoned) and
MaiDenSnow Eve have a very similar combat system, and it's still probably the most advanced i've seen in any RPG Maker game despite being old now. For non-adult games, The Last Word had a really interesting combat system which was more like rock-paper-scissors combined with tug-of-war.
To keep this on-topic, i have no idea about the OP's skills or experience, but the games i've listed would be complicated even if you have experience. I only list them for inspiration. Just because it's RPG Maker doesn't mean you can't make something interesting for gameplay.
