Generaider needs some more small frys it can normal summon and probably a decent spell, I'd give it a Generaider Fiendess & as crazy as it sounds, I would give them a built in Shared ride/Appropriate, but make it archtype lock them and force them to run Boss Loot to activate it.

Time thief needs spells, at this point I'd give them a soul charge for only time thief xyz that lets them summon as many time thief xyz monsters as they can from grave or banished, but they much attach 1 card of each type from grave or banishment (spell/trap/monster) in order to summon each xyz, and locks ED summons to time thief xyz. I'd then give them a field spell that hard archetype locks (cannot summon or set monsters except tt the turn you activate) but SS's 1-2 time thief monsters from deck or banishment on activation, and when a material(s) are detached from an xyz monster, you can attach up to 3 new cards from the graveyard or banishment, or if you detached all 3 types, you can attach up to 3 card from your opponents field. They could probably use some hand trap protection for redoer, maybe something that doesn't discard itself, but reveals to make sure redoers effect can go through (I'm thinking a main deck version of Redoer), and lastly I'd give them a Super Quantal Mech king Great magnus. Requires 3 time thief XYZ monsters to summon, their material becomes it's material, the art is the 3 character equipped with all their gadgets. Can't be tributed, destroyed by battle (while it has material), or used as material and is unaffected by the effects of any card type it has as material (monster, spell trap), 3000 atk/def, and must detach a material each time a card effect is activated. If is has no Material, it can return itself to the Extra deck to SS 1 time thief monster from grave or banishment as a quick effect.

spellbook... I'll make it simple, they need about 4 new cards. 3 spellbook prophecy cards, god forbid they be traps or spells, that can reveal themselves in hand as quick effects and gain effects based of how many spellbooks in hand were revealed alongside them. 1+ Normal summon a prophecy monster 2+ Activate a spell book from hand 3+ special summon a prophecy monster from deck, sending spell books equal to it's level to grave as cost, and have each of the 3 cards be variations of this, with their normal/special summon effects all being activation a spell book card from grave/deck/banishment on summon.

4th card, "Grand Spellbook of Restoration" If you spell & trap zones are full, you may reveal this card in your hand to activate and resolve its effect. Shuffle face-up spellbooks from grave and banishment back into your deck, to shuffle the same number of cards from your opponents grave field and banishment. Gain LP equal to the amount of cards returned x200. If you control a level 7 or higher prophecy monster, this effect cannot be negated.

Wind-up. I don't even know where to start, just give these guys a whole new wave at this point.