Piercing antigua up to 5*

Simple: An antigua that maintains it's pierce ability. As it goes through upgrades, it becomes more... Well, sharp.
4* - Grandaevis
"An ancient handgun that fires small drills as bullets. Probably wielded by a hot-headed knight."
It's the same as the blackhawk/silversix, in all but damage and charge attack. It does piercing damage, clearly. The charge attack is instead quite different. instead of firing 5 normal shots and a 6th, more powerful one, it instead skips straight to the more powerful shot. The powerful shot is literally a flying drill. It can hit enemies multiple times, as it literally pierces through them (Think righteous bison in tf2).
In terms of looks, it's pastel red/orange, and has a straight, jaggedy fin on top.
5* - Caelestis
"A powerful handgun that fires drills as bullets. The side has "Pierce the heavens" engraved on it. Once wielded by a manly knight, is now favored among louder knights."
Same as before, but the drill is a lot bigger, glows, and can hit a lot more times on a single enemy. The bullets also have a spiral trail behind them.
In terms of design, it gets the second bottom fin like the other guns, and it's full on red now. Also, the barrel will have some kind of engraving on it. Giant robots not included.

But clearly not as manly and awesome as this one.

manly and awesome? where? I can't see it. all I see are guns that fire drills. also, if you want a different charge, you must change the whole antgua line first.
lastly, tell me: are you against women (or better, you think that men are better?)? why then emphasize the "manly" thing? it doesn't make sense.

A slight thing you didn't pick up on, then.

Thunder, it's a reference. Multiple references, even.
And yes, pierce antigua line has been suggested multiple times since the removal of the pierce/elemental split was originally made, but I've seen none of them that have been thought out beyond "antigua, but with piercing" as the entire volume of the suggestion. The new charge is an interesting idea, at the very least. As is the idea of literal piercing attacks, actually.

the intersting thing has already been suggested.
ok, csomeone make that reference or I'll understand nothing.

I don't think the existing Antigua splits need any more re-balancing, for good or for bad. They've both already had a few changes made that have irritated users and as they are right now, they're rather balanced.
There's a visible reference to Gurren Lagann, and a very minor nod to Katawa Shoujo in his post. The fact you didn't get them is arguably a good thing because it means that people who dislike either can choose to ignore them easily, or outright refuse to say they even exist.

I had thought of gurren lagann, but then I thought "nah". since I know little of that manga/anime, I'll stop here. I'll google it and the other one.
as for the different charge, if this one gets released, many of the antigua lie users will say: "hey, without the shots in the charge is way better. why didn't they removed from the others too?" (translate in noobish if you want to be more realistic). so, if this gets another charge, we must change the others. unless this will be underpowered, so no one will ever think about that.

This weapon has potential to hit more enemies, but has less overall damage in the charge.

tecnically, the antigua charge change it's a nerf, so it will not be a problem to say that.
and for your weapon, I would add more interruption on normal shots and less knockback in the charge respect the other 2 of the series. just to make it different and more "piercing" (means: more 1 shot damaging)

I don't think you'd get the reference to the second one unless you play it for yourself, but there's a character called Misha with bright pink drill hair who is infamous amongst in-game characters for her complete lack of volume control, hence "favoured among louder knights".
And yes, the charge may not be balanced right off the bat, but that's what the testing server is for. Saying that the Antigua line charges must be the same, however, is like saying that the Snarble Barb line has to have the same charge attack as the Flourish lines. Not really true, and things can be changed the make the piercing charge attack on-par, but different, to the elemental and shadow charge attacks. Different playstyles are to be encouraged, after all, if you don't want everyone going with Vog Cub, Crest of Almire, Divine Avenger and Blitz Needle as many tend to do.

I also thought of Gurren Lagann because of this.
Also I like this version better.

alfiesr, flourish and snarble are 2 different weapon lines. I thought about weapon lines. weapon lines charge should not be different.

I read somewhere that both Sentenza and Argent also had piercing damage mixed in. Was it considered OP? Why was it changed?

Maybe... the snarby set needs a gun so call it the 5 star the bolax gun or somthing?
Has been suggested before.
Antigua that has pierce? Has already been suggested before.