[You should sound like you're scheming but then it goes into a shout mid way of the lines and then back to a scheming tone as she boasts about her gadget(s).]

"Finally, this is my chance to show off what i can do, my support items are gonna steal the spotlight for these wanna be heroes, everyone! observe what my brilliant gadgets can do. wire arrows, and hummer souls!"

[Her voice should sound happy and mildly energetic]

"Heh heh heh... Failure is the mother of invention, Power Loader-sensei. Thomas Edison once said that. Just cuz a creation doesn't work as intended doesn't mean the effort is wasted.