Managed to slog my way though DMD(painfully) so I can use Super Dante/ Nero. Yeah Super Nero is arse. Constant Max-Act is beyond annoying.
Credos spears are pretty terrible weapons. There are plenty of ways around them or to style with 'em.
Firstly Neros active frames on his grab is a lot later than it looks. Basically you want to grab the spear a little but earlier than you think you would. Not entirely sure why but you can actually grab the spear with Neros back to the spear. I would think it's because of the hurt box being small and Neros grab being large but it works.
Also table hop for lulz
Boss trolling is something that I frequently do. It comes down to a few different factors.
The first I'd say is understanding your character movement. Basically that means knowing how they move and their animations.
The second is knowing the boss movement and attacks. For example Credo has 2 similar attack strings but one ends in him jumping up and ping his downward air slice. This also falls under his attack counters such as grabbing a spear it countering him with Neros own sword.
Lastly is confidence. This is with all these types of games like Bayonetta, MGR:R, Ninja Gaiden etc, you get pretty confident at fighting bosses to the point that you can destroy them with ease/ without thinking. In my video link it's on Hell on Hell which means you have to fight properly as it's 1 hit K.O for you but enemies and bosses have full life bars. Having fun/ taking the piss/boss trolling is what this all falls under.
Getting there
Keep in mind though, that using a constant fully charged Red Queen changes how the fight would normally go. If you use a normal Streak on Credos shield he'll block/counter. But with you are charged with Red Queen, you'll break it. Having it constantly revved doesn't help with learning boss fights. Especially if you start to rely on it too much. It's worth learning how to Ex/Max-Act.
