Damn this club moves fast without telling me xD
As i've recently completed my squier bass modification, i've been thinking if i were endorsed - who & what for?
Strings: D'addario - never gone wrong with tone & always on point, they just feel right & consistent.
Pedals & Picks: Dunlop/MXR - I already own two MXR pedals (10 band EQ & Bass D.I.+ will soon own the stereo Chorus) & i've found my perfect pleck as well; 0.88 Green tortex. I've always used dunlop picks over the years ranging from .96 - 1.14 nylon/max grip. I've also used Daddi picks but mostly 1.0 thick but they'd get rounded off quick & chip if they got too weak. Once i found the 88s at work & played, i was blown by the attack it gave & pronounced clarity. The tortex is rigid enough to dig in without being flimsy & keeps my groove steady!
Pickups: Seymour duncan (for the most part) - i've grown to love the sound it gives me (as well as some of my friends) for the music i play. I hated the look of the QP cause of the extra large poles but after hearing them in the music i write, it just fit perfectly. Other Duncan pickups work too such as the classic stack for jazz bass, vintage & hot for pbass pups. Not everything duncan has is usefull for me (not guitar wise - that's Dimarzio & some of their bass stuff isn't all that great). But it's just enough growl & bite to my basses through my rig.
Amp wise: Peavey & SWR hands down! I've never played through a better rig than my own & would love to collaborate with Peavey to build an updated version of the century bass head i own (adding a D.I output, giving more power around 300-450 Watts - maybe a louder one at 800watts) & for SWR (7ender) to remake the Goliath cabs. I could probably substitute with ashdown or Gallien Kruger, but might not be the same
As for basses: I've got it covered with building them myself

no need for an outside brand that won't deliver what i want on the spot: i've got preference for everything & all my current & future basses are built for exactly what i like & what i need for certain tones, feels & playability. I love the pbass sound for sure since it is my go to tone for a lot of music, but i enjoy my fair share of in your face Gibson buckers.
How bout you guys? It doesn't have to be as long & elaborated as me

but in ways of picks, strings, basses & amps, how did you find your signature tone?
I love D'Addario strings. I also use Dunlop picks, but of the lavender 1.5mm thickness. Anything less is too thin for me.
I like Duncan pickups on guitar, but not really on bass. SWR amps are basically the opposite of what I go for.
Strings: D'Addario XLs. 170s usually for EADG. For BEAD I use the gauges 130, 100, 80, 60. I like them because they're bright, but not too bright, and they seem to last quite a long time, and still sound pretty good even when they're dead. I've tried many other strings, but I keep going back to these. They're home for me.
Picks: As mentioned, Dunlop 1.5mm, scored across one side with a knife for better grip. I don't like the feeling of pick flex, so I use ones that hardly flex at all.
Pedals: No one particular company. With my pedalboard, I have pedals from Boss, Korg, EHX, Dunwich, and Morley. Currently running TU-3 -> Miku Stomp -> Ravish Sitar -> Gnarly Dunwich Muff -> Dual Bass Wah -> Holy Grail Reverb. The Miku is essentially just for noise. I use the Sitar pedal occasionally when I'm playing with a really twangy sound, to create a different sort of atmosphere, and fill up a bit more sonic space. I usually use it in conjunction with the reverb. The Dunwich is a custom muff build. Can't post it on here, either, because the artwork is NSFW. I basically only use it for parts where the sound needs to get extra heavy, or, on a different setting, in conjunction with wah (basically the difference is a mid switch that goes between more and less mids; the latter works better with wah because wah adds in so much midrange). The wah I use frequently, often for making fills stand out more. I also use it in conjunction with fuzz in a way that has often been mistaken for a flanger by listeners. The reverb I use often at the end of songs, when I'm producing feedback, or whatever situation calls for reverb and it wouldn't make the sound too muddy. It's especially nice when using e-bow.
Pickups: I have Thunderbuckers in the T-bird, but aside from that, all my basses have Rickenbacker pickups. Of the Rickenbacker pickups, the most important one to my sound is the high gain bridge pickup, which I usually use by itself. Some people like the older, weaker ones, because they're brighter, but I prefer the newer, higher output ones as they sound nastier. With the T-bird, I wired the bass in series to get a similar, throaty sound, since the pickup positions are different. Note that series wiring can present some issues with noise when using Thunderbuckers. My tech was able to solve this, though.
Amp: Mesa/Boogie D-180 (precursor to the Bass 400). I get most of my overdrive from here. Currently loaded with Sovteks in the power section. Basically it has this incredibly aggressive grind that works really well in a dense rock/metal mix. I turn the mids all the way up for maximum gank.
Cabs: Occasionally I'll use an Ampeg 1x15, but most of the time I'm running through a Sunn 2000S 2x15 cab loaded with Faital 15PR400s. It's enormous, but its only the same depth as a typical guitar 4x12, so it actually doesn't take up nearly as much room on stage as one would think. It makes packing with the guitar cabs easier, too, and presents a sort of uniform backline. More importantly, it sounds colossal, yet not the least bit muddy. Especially with the neo drivers, its lows are very authoritative, but quite clear. I use the Faitals because they're said to approximate the sound of the stock drivers, vintage JBLs, but handles a lot more power and a lot more low end, which is important given that I'm in two loud doom metal bands and tune down to BEAD.
Basses: Besides the Epiphone, I have a heavily modded Peavey and two Rickenbackers. The Peavey was my first bass and started life as a P-bass copy. Since then it has been a mod and sticker platform. Currently it sports a Rickenbacker high-gain pickup (of the bridge type), a BadassII bridge, and a volume knob from the USSR. The Rickenbackers are my main basses. My restored and custom-refinished 4001 is my EADG bass, and sadly doesn't get as much action as it deserves these days. The 4003S is my main stage and recording bass with my doom bands. Most of the time with the Rickenbackers, I'm only using the bridge pickup, though I use the neck pickup for quiet parts and e-bow. And, of course, there's the Thunderbird. It's sort of the secondary stage bass with the doom metal bands. Might become the main one for one of them where a less nasty tone is required due to only having one guitarist. Currently waiting on custom pickguard, control plate, and TRC from Ertmer music. I have it wired series/parallel with a push/pull bridge volume pot, and the tone knob has been replaced with a rotary pickup switch. Because I don't like tone knobs, I do like pickup switches, and rotary switches are just plain cool.