LPST-JP001 Dark Magician
ドン is an Sound Effect to emphasize something dramatic has appeared or is happening.

LPST-JP002 Dark Magician Girl
OK is short for Okay, which means something is fine.

LPST-JP003 Blue-Eyes White Dragon
最強 is “STRONG”

LPST-JP004 Red-Eyes Black Dragon
いくぜ！ is “Let’s go!”

LPST-JP005 Skull Servant
そう思う is “I think so”

LPST-JP006 Neo-Spacian Aqua Dolphin
オッケー！ is Okay!

LPST-JP007 Maxx “C”
キラーンis *twinkle* *shine* *glint* *sparkle* *shing* or *sheen*

LPST-JP008 Tour Guide From the Underworld
こちらデス is “This way please”, with デス being how you spell “Death” in Japanese (Tour Guide is Death Guide in Japan) and デス is a polite way of stating things.

LPST-JP009 Ash Blossom & Joyous Spring
無効です is basically “Negated” or “Denied”

LPST-JP010 Ghost Belle & Haunted Mansion
ダメです is “No good”

LPST-JP011 Sky Striker Ace – Raye
真剣［マジ］です！ is Seriously! or For Reals!

LPST-JP012 Nibiru, the Primal Being
向かってます is “I’m on my way”

LPST-JP013 Laundry Dragonmaid
すみません！is “Sorry!”

LPST-JP014 Ghost Mourner & Moonlit Chill
泣ける is Cry(ing)

LPST-JP015 Eldlich the Golden Lord
おつかれ can mean a bunch of things but I believe in context here it’s “I have arrived”.

LPST-JP016 Tri-Brigade Kitt
ニャるほど！is なるほど (I understand/I see) with a playful ニャ (meow)

LPST-JP017 Lovely Labyrnth of the Silver Castle
お待ちしております is “Look forward to seeing you”

LPST-JP018 Astellar of the White Forest
むう is a sound of annoyance

LPST-JP019 Trishula, Dragon of the Ice Barrier
YES! is the English word YES with an exclamation point

LPST-JP020 P.U.N.K. Jam Dragon Drive
おけましておめでとう！ is Congragulations!

LPST-JP021 Divine Arsenal AA-ZEUS – Sky Thunder
マカセロ！ is LEAVE IT TO ME!

LPST-JP022 Traptrix Sera
えへへ is Ehehe … which is a laugh.

LPST-JP023 I:P Masquerena
おまたせ！ is Sorry to keep you waiting

LPST-JP024 Cross-Sheep
うんうん is Mhm Mhm or Right right

LPST-JP025 Promethean Princess, Bestower of Flames
許さない is Yurusanai, “I won’t allow it” or “Unforgivable”

LPST-JP026 Monster Reborn
復活 is Revive(d)/Reborn/Rebirth/Return(ed)

LPST-JP027 Swords of Revealing Light
３ターン待って is Wait 3 Turns

LPST-JP028 Raigeki
モンスターを全て破壊！ is Destroy all monsters!

LPST-JP029 Scapegoat
お✬や✬す✬み✬ is “Ni✬ghty✬Ni✬ght✬”

LPST-JP030 Mystical Space Typhoon
速攻！ is Immediately! or Quick Attack!

LPST-JP031 Reinforcement of the Army
うぉおぉぉ！ is basically like a yell

LPST-JP032 Pot of Avarice
ニタリ is SMIRK. As in like a grin.

LPST-JP033 Forbidden Chalice
まぁいっか is basically Oh Well or Okay, Whatever

LPST-JP034 Fossil Dig
調査中 is Under Investigation

LPST-JP035 Called by the Grave
それな is “That’s it” or “That’s the one”

LPST-JP036 Crossout Designator
No！is the English word NO with an exclamation point

LPST-JP037 Fateful Adventure
行こう！ is Let’s Go!

LPST-JP038 Purrely Pretty Memory
わーい is Yaaay

LPST-JP039 New Frontier
いってきます！is I’m Off! or I’ll See You Later!

LPST-JP040 Stand-Up Centur-Ion!
いくぞ！ is Let’s Go! or Here We Go!

LPST-JP041 Magic Cylinder
お返しします is Back at ya or Back to you

LPST-JP042 Solemn Judgment
待った！ is WAIT! or HOLD IT!

LPST-JP043 Compulsory Evacuation Device
帰る！ is Go Home! or GET LOST!

LPST-JP044 Solemn Warning
ちょっと待って！ is Wait a Minute! or Hold the !@#$ on! It’s a more intense or demanding version of 待った！

LPST-JP045 Mikanko Promise
やくそく is (I) Promise

LPST-JP046 Slifer the Sky Dragon
神 is Kami, which has a lot of technical minutia when using it with regards to Shinto proper, but for our purposes more or less means “God” here.

LPST-JP047 Obelisk the Tormentor
神 is Kami, which has a lot of technical minutia when using it with regards to Shinto proper, but for our purposes more or less means “God” here.

LPST-JP048 The Winged Dragon of Ra
神 is Kami, which has a lot of technical minutia when using it with regards to Shinto proper, but for our purposes more or less means “God” here.