The components below primarily make changes to gameplay, visuals/graphics, and interaction (except the Tweaks component list, some of which allow closer-to-pen&paper changes). Most of these have little to do with the pen & paper rules, they just modify the game experience rather than changing the equivalent of the AD&D Dungeon Master's Guide (tm). BG1/2 are 2nd Edition rules, so some things will definitely be different if you areused to newer rules:
EASYTUTUDEGREENIFIER
~SETUP-TUTUFIX.TP2~ #0 #1 // Organised Journal Entries
~SETUP-TUTUFIX.TP2~ #0 #3 // BG2 Ammo Stacks
~SETUP-TUTUFIX.TP2~ #0 #5 // BG1 Summoning Spells
~SETUP-TUTUFIX.TP2~ #0 #7 // Walking Speeds
~SETUP-TUTUFIX.TP2~ #0 #10 // BG2 style world map [Requires new game to take effect]
~SETUP-TUTUFIX.TP2~ #0 #12 // Journal Entry Titles
~SETUP-1PP.TP2~ #0 #0 // 1PP: Everything but Potions
~SETUP-1PP.TP2~ #0 #1 // New Potion Graphics
~SETUP-SONG_AND_SILENCE.TP2~ #0 #0 // Changes to trueclass bards and thieves, and unmodded game kits (required for other components)
~SETUP-SONG_AND_SILENCE.TP2~ #0 #1 // Add new bardic store and thief items
~SETUP-TTSGSERIES.TP2~ #0 #0 // BG Tutu sgSeries by Yovaneth
~SETUP-HCTUTUAO.TP2~ #1 #1 // Area 1010 - 2nd Level of Ice-Island
~SETUP-SIRINESCALL.TP2~ #0 #0 // The Lure of the Sirine's Call
~SETUP-TGC1E.TP2~ #0 #0 // The Grey Clan Episode One: In Candlelight, BG1TUTU edition v1.00
~SETUP-BG1NPCMUSIC.TP2~ #0 #0 // The BG1 NPC Project Music Pack
~SETUP-GMINION.TP2~ #0 #0 // gMinion v1.8
~SETUP-EASYTUTUSPAWNRANDOMIZER.TP2~ #0 #5 // EasyTutu Spawn Randomizer -> Base Spawn Chance: 80%
~BG1NPC.TP2~ #0 #0 // The BG1 NPC Project for BG1 Tutu: Core Install
~BG1NPC.TP2~ #0 #1 // The BG1 NPC Project for BG1 Tutu: Phase I (Banters)
~BG1NPC.TP2~ #0 #2 // The BG1 NPC Project for BG1 Tutu: Phase II (Quests and Interjections)
~BG1NPC.TP2~ #0 #3 // Jason Compton's Accelerated Banter Script.
~BG1NPC.TP2~ #0 #6 // Give Edwin his BG2 portrait.
~BG1NPC.TP2~ #0 #7 // Give Imoen her BG2 portrait.
~BG1NPC.TP2~ #0 #8 // Give Jaheira her BG2 portrait.
~BG1NPC.TP2~ #0 #9 // Give Minsc his BG2 portrait.
~BG1NPC.TP2~ #0 #10 // Give Viconia her BG2 portrait.
~BG1NPC.TP2~ #0 #14 // Non-joinable character portraits
~BG1NPC.TP2~ #0 #15 // Coran's Romance Core (Rated: R)
~BG1NPC.TP2~ #0 #16 // Placeholder 1: New Quests
~BG1NPC.TP2~ #0 #17 // Dynaheir's Romance Core (Rated PG13)
~BG1NPC.TP2~ #0 #18 // Shar-Teel Relationship Core (Rated R)
~BG1NPC.TP2~ #0 #19 // Branwen's Romance Core (Rated PG13)
~BG1NPC.TP2~ #0 #21 // Xan's Romance Core (Rated PG13)
~BG1NPC.TP2~ #0 #22 // Ajantis Romance Core (Rated PG13)
~BG1NPC.TP2~ #0 #23 // Female Romance Challenges
~BG1NPC.TP2~ #0 #26 // Coran's Romance Speed -> Coran's Romance Speed (30 minutes)
~BG1NPC.TP2~ #0 #30 // Dynaheir's Romance Speed -> Dynaheir's Romance Speed: 30 minutes
~BG1NPC.TP2~ #0 #34 // Xan's Romance Speed -> Xan's Romance Speed: 30 minutes
~BG1NPC.TP2~ #0 #38 // Shar-Teel's Romance Speed -> Shar-Teel's Relationship Speed: 30 minutes
~BG1NPC.TP2~ #0 #42 // Branwen's Romance Speed -> Branwen's Romance Speed: 30 minutes
~BG1NPC.TP2~ #0 #46 // Ajantis' Romance Speed -> Ajantis' Romance Speed: 30 minutes
~SETUP-TUTU_TWEAKS.TP2~ #0 #43 // Weapon Animation Tweaks
~SETUP-TUTU_TWEAKS.TP2~ #0 #46 // Icewind Dale Casting Graphics (Andyr)
~SETUP-TUTU_TWEAKS.TP2~ #0 #58 // Icon Improvements
~SETUP-TUTU_TWEAKS.TP2~ #0 #83 // Add Bags of Holding to BG1
~SETUP-TUTU_TWEAKS.TP2~ #0 #86 // Exotic Item Pack
~SETUP-TUTU_TWEAKS.TP2~ #0 #89 // Reveal City Maps When Entering Area
~SETUP-TUTU_TWEAKS.TP2~ #0 #92 // Add Map Notes
~SETUP-TUTU_TWEAKS.TP2~ #0 #126 // Force All Dialogue to Pause Game
~SETUP-TUTU_TWEAKS.TP2~ #0 #129 // Use Valen/Solaufein Style Interjections
~SETUP-TUTU_TWEAKS.TP2~ #0 #179 // True Grand Mastery (Baldurdash)
~SETUP-TUTU_TWEAKS.TP2~ #0 #182 // Un-Nerfed THAC0 Table, Saving Throws, Grand-Mastery, and Arcane, Divine Spell Progression (Blucher)
~SETUP-TUTU_TWEAKS.TP2~ #0 #191 // PnP Spell Progression Tables
~SETUP-TUTU_TWEAKS.TP2~ #0 #197 // Cast Spells from Scrolls (and Other Items) at Character Level
~SETUP-TUTU_TWEAKS.TP2~ #0 #270 // ToB-Style NPCs
~SETUP-TUTUGUI.TP2~ #0 #0 // Baldurs Gate I GUI for Tutu
EDIT: Duh, I forgot: I usually prefer NiGHTMARE's portrait pack to the BG1NPC version. I clipped this list out of parts of my current install, and forgot that since I was playing around with BG1NPC, I was using that instead... NiGHTMARE won't promote it, but I definitely will
all of these successfully interact -- just be sure to download the latest versions and upgrade to the latest WeiDU (v192 if you want BG1NPC and Coran to work as intended!).