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So I've made a character specifically to abuse the bard's ability to infinitely multiclass that comes out to be (in order of what level they are attained) a Half-elf Valorous Bard/skald/paladin/warlock/swordmage/warlord/cleric who is military trained (Purple Dragon theme), worships Amaunator, and comes from a merchant hub city (Airspur background). The swordmage part may or may not come out not finalized yet.

Now while ruleswise it's totally sound I can't think of how to explain and roleplay something like this. Since I have no real roleplay idea for this I have no idea for appearance or even gender either.

Bard's are considered to be naturally scholarly, represented by their +1 bonus to all untrained skills and the Bard-Of-Many-Trades feat, and thus you could explain your diverse class selection as a result of your research and study. For instance, you might have studied the fightining techniques of an ancient warrior-king to better understand him and capture his persona in song, while also gleaning a few points about martial leadership (warlord), or while studying up on the gods in a remote temple, you learned a few simple prayers so you could include them in future artistic works (paladin/cleric).
Lather, rinse, and repeat for each class.

I like the acting idea. It allows me flexibility and the ability to just be outright ridiculous which I like because I like my sessions to be silly and fun.