Lex, that's incorrect: Flip Summon only occurs when you, on your own turn, flip your monster from face-down defense position to face-up Attack Position. However, the Hero's effect is also meant to trigger in case your opponent flips it up (by declaring an attack against it or activating a spell like Swords of Revealing Light). That wording is absolutely correct. There's a subtle difference between flip summoning and flipping face-up. Consider cards like Stealth Bird. If the birdie is attacked or flipped by a card effect, its effect doesn't trigger but if you Flip Summon it yourself it does 1000 damage to the opponent. Big difference there. :3
But...*Twitch* I want to growl at Peace's deck...*Twitch* But yeah, suffice to say that you seriously need the heart of the cards to pwn anyone short of a complete n00b with that deck. Fully agreeing with ACC's judgement: even Joey Wheeler from the anime uses a more consistent one, and that's saying a lot. :\
Anyways, ACC, since you asked: first off, United We Stand is still limited to one per deck, yet you have three. Dispose of those duplicates, because you have a blatant weak here: no spell or trap removal at all. .__. At the very least you should throw in Mystical Space Typhoon and Heavy Storm, because otherwise stall players like Tacey are going to walk all over that poor boy (Lawl, stall cards left right and center). Also, -2 Bad Judgement, +1 Mirror Force, +1 Ring of Destruction would be advisable. Those are standard field-cleaning measures and you can't always count on having enough monsters in your graveyard for Skull Lair. Also, seeing as how the wanderers are mostly swarming type monsters you should avoid having an empty field like the plague, meaning that your opponent shouldn't get that many direct attacks on you anyways. Heck, you could even drop that third copy for Premature Burial. I'd also like to see a copy or two of Shrink in there since your wanderers can't really handle tribute monsters that well (not to mention that they help your wizard's spell recursion ability a lot. As it is, that one won't be very likely to have anything worthwhile to bring back), possibly drop a copy each of wizard and healer to make room. I'd also like to suggest considering Sangan in there since four of your wanderers are at or below the 1500 Atk mark, but if you want to keep the monster lineup thematically pure that's fine. ^^
And fine, since I've been criticizing anyone is free to return the favor. Just make sure to give some actual arguments as to why something should be removed or replaced. No touching Curran and Pikeru, though; they're there for my character's sentimental reasons. :3
As for custom cards...well, I originally planned to play my parasite demons (Remember those, ACC? :3) but they were just...not my character's style at all, and it seems sort of late to come up with a new card set...unless of course we're allowed to change cards in mid-RP; but I assume that's not the case.