[@King Cosmos] There's some people with like, no extra to 4 cards total. Take Emi, for example. I legitimately don't intend to use anything except for Ice Barrier Synchros in their deck, simply because nothing else is a thematic fit. In that regard, there's a ton of stuff I don't like in your Lightsworn decklist. Black Rose, Scarlight, Omega, Crystal Wing etc. seem to be there because they have good effects rather than any themes in your deck, i.e. holy guardians summoning their big deity 'fuck off' dragon. In that regard, what is a performage doing in Nekroz? I get its effect can be synergetic, but it's be real weird for a random clown to pop up in the midst of a slew of cosplaying peeps. Jigabyte still sorta fits because Nekroz certainly has a few monstrosities, though.

And no, you don't need to swap out Nekroz. What I *will* expect and ask is to not play them optimally, though. I'd rahter not every duel with your number one be 'summon - negate activate - negate - negate - negate' as that is incredibly boring to read.

And I could throw in a few S/T suggestions for Nekroz. 

Ice Mirror- Summoning card and Nekroz work with mirrors anyway. 
Spiritual Water art Aoi - Nekroz do rituals anyway, rituals in which they sac themselves, so this slots right in.
Ritual Weapon - Nekroz dress up anyway and some of them are level 6 or lower, so giving them a boost in ATK like this works really well.

Theese are just random suggestions after five minutes of searching in YGOpro, though, so don't take them as the be all end all and don't feel pressured to put them in. All I'm saying is, these cards aren't as thought about and, sure, you'd never play them in an actual Nekroz deck, but that's the fun part. You don't *have* to make this a real deck.

As for the Gagaga ones- I've actually played Gagagas before in RPs. I selected the monsters I went for very carefully, making sure to stay within the boundaries of spellcasters and warriors for the most part. They don't have to be the most versatile thing in the world as there's a lot you can do with very little. In fact, I urge you to take a look at [url=https://www.youtube.com/channel/UCVUg6cHO4ZUXuKujf8aREMA]this[/url] youtube channel. He often does scripted duels which he animates by re-editing clips over a greenscreen in the BG of YGOpro, and makes sure to be very faithful to character playstyles and decks. Some of my favorites are to be found [url=https://www.youtube.com/watch?v=Jsn-QO5HzLU]here[/url] and [url=https://www.youtube.com/watch?v=SRoMf_PWhd4]here[/url], which show off how well you can script with not too much to work with.

I also recommend checking out [url=https://www.youtube.com/watch?v=LSCpSdFW1qA]this[/url] one. Akaba Leo has a total of six cards, yet Yumers gets creative and makes it work anyway. Hell, Akaba Leo is winning for the most of it.