That'll be Buddy.
Also you don't seem to have completed Illyria or The Intersphere, nor the senders for those (assuming my guesses were right).
There's a good reason for that, and the reason is I forgot.
actually fill in Illyria dammit
Molekuláris Gépezetek for Thy Catafalque btw
You can't make me. Maybe I'll leave it like this forever.
??: S_a_s
1: T__ S___d
2: L__a__
TAC: Illyria
1: Autumn Fades Away
2: Kenopsia
3: Winter's Wedding
Stadler: Our Lady Peace
1: Sta_s__d
2: S_____a_'s D_ad
3: S________ __t T____
4: _a_
Buddyhunter1: Thy Catafalque
1: Molekuláris Gépezetek
??: __it_ _a_d
1: Still____ ____l_d__
2: _la__ Sil__t _i__s
??: _i_ali
1: I_t__
2: L__ill_
3: ____d _
4: _______d_ ____
5: __-___
6: __t_i__ t_ L_s_
??: _______
1: _i__t __ t__ __t_i_i_d S_a
2: T__ _a_d__i__ S_ad__s
??: T__ __t_li__
1: ____ D___ __st
2: _ia__ _la___
3: T__ D_li___a___s
4: S__t A_i_al
The Walrus: Luca Turilli's Rhapsody
1: As___di__ t_ I__i_it_
2: Da_t_'s I______
3: Da__ _at_ __ Atla_tis
??: Kiss Kiss
1: _a__t
2: _a__i__s
3: _la___ __
4: I______t _
5: I______t _
6: _at_
??: _id_i__t _d_ss__
1: A_ai_st t__ ____li__t
2: T__s_ ___ Li____ at _i__t
??: T_a_s ___ __a_s
1: ___a_ i_ __ai_s
2: S__t___s __ _ai_
3: _a___s Last ___ds
4: ___d_i__t S___
romdrums: The Intersphere
1: Relations in the Unseen
2: Sleeping God
3: Out of Phase
4: The Grand Delusion
5: Soapbubbles in the Rain
Elite: Scarlet Stories
1: The Gallows Tree: Part II The Price You Paid
2: In Blood and Limbs and Gore and Clay
3: Nostalgia in a Closed Mind
??: __i_al __a_
1: I___ _ist i_ a __l__t _l___
2: __il S__ll
3: ___l_a_ _i__
4: __ll____ast__
Guessed letters: SDAITL